Magnetorheological piston assembly flanging machine

Abstract

The invention discloses a magnetorheological piston assembly flanging machine which comprises an assembly fixing device, a lifting driving device, a rotating shaft and a rotating driving device, a plurality of flanging pressing wheels are arranged on the lower portion of the rotating shaft, the rotating driving device drives the rotating shaft to rotate, and the assembly fixing device is arranged below the flanging pressing wheels. The assembly fixing device is used for placing a magnetorheological piston assembly, and the lifting driving device drives the assembly fixing device to be far away from or close to the flanging pressing wheel. The upper piston pressing plate and the lower piston pressing plate are fixed through spin riveting and flanging, the reliability is guaranteed, and meanwhile, compared with welding, the method is more environmentally friendly and economical.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorber production, and particularly relates to a flanging machine for a magnetorheological piston assembly. Background Art

[0002] A magnetorheological shock absorber is a new type of actuator with adjustable damping force. Its working fluid is magnetorheological fluid. When the piston moves relative to the cylinder block, the magnetorheological fluid will be squeezed and pass through the damping channels on the piston, so that the magnetorheological fluid will generate shear force. At the same time, the rheological characteristics of the magnetorheological fluid can be changed under the action of a magnetic field. Under the action of an external magnetic field, a reversible transformation between Newtonian fluid and Bingham fluid can be realized within milliseconds. Therefore, the magnetorheological shock absorber has the characteristics of fast response speed and large damping force adjustment range. The existing piston assembly in a magnetorheological shock absorber generally includes a piston housing. A magnetic core is arranged inside the piston housing. Then, through two upper and lower piston pressing plates, the magnetic core is fixedly installed inside the piston housing. A main flow passage is formed between the inner wall of the piston housing and the outer wall of the magnetic core. A plurality of through holes are provided on both the upper and lower piston pressing plates of the piston, and the through holes are communicated with the main flow passage for the magnetorheological fluid to flow through. The two upper and lower piston pressing plates fix the magnetic core inside the piston housing, generally by welding. The high temperature generated during welding easily causes local deformation and oxidation of the electromagnetic coil, and welding also has problems of large pollution and uneconomicalness. Summary of the Invention

[0003] The purpose of the present invention is to provide a flanging machine for a magnetorheological piston assembly, aiming to solve the problems of large pollution and uneconomicalness in the assembly production of the existing piston assembly.

[0004] To achieve the above purpose, the present invention discloses a flanging machine for a magnetorheological piston assembly, including an assembly fixing device, a lifting driving device, a rotating shaft, and a rotating driving device. A plurality of flanging pressing wheels are arranged at the lower part of the rotating shaft. The rotating driving device drives the rotating shaft to rotate. The assembly fixing device is arranged below the flanging pressing wheels and is used for placing the magnetorheological piston assembly. The lifting driving device drives the assembly fixing device to move away from or close to the flanging pressing wheels.

[0005] Preferably, it further includes a guiding device. The guiding device includes a mounting plate and two guide rails. The assembly fixing device is fixedly installed on the mounting plate. The two guide rails are arranged vertically. The mounting plate is slidably arranged on the two guide rails. The lifting driving device drives the mounting plate to move away from or close to the flanging pressing wheels.

[0006] Preferably, the lifting driving device is provided with a lifting end. The lifting end is fixedly connected to the lower end surface of the mounting plate. The assembly fixing device is fixedly installed on the upper end surface of the mounting plate. The mounting plate is L-shaped, and the side surface of the mounting plate is slidably arranged on the two guide rails.

[0007] Preferably, the assembly fixing device includes a base and a positioning tooling. The positioning tooling is arranged on the base. The positioning tooling includes a positioning sleeve seat, an upper die, and a lower die. An accommodation cavity is provided in the positioning sleeve seat. The upper part of the accommodation cavity is a piston assembly accommodation cavity, and the lower part of the accommodation cavity is for placing the lower die. A lower plug is provided at the top of the lower die. An upper plug is provided at the bottom of the upper die. Lower positioning components and upper positioning components for aligning with the lower plug and the upper plug are respectively provided on the positioning sleeve seat.

[0008] Preferably, there are multiple lower plugs, and all the lower plugs are arranged in an axisymmetric manner around the axis of the lower die in a circular shape. There are multiple upper plugs, and all the upper plugs are arranged in an axisymmetric manner around the axis of the upper die in a circular shape. The number of the lower plugs is the same as that of the upper plugs.

[0009] Preferably, the upper positioning component includes an observation gap. The observation gap is arranged on the outer peripheral wall of the upper part of the positioning sleeve seat. An upper gap is formed between the two upper plugs, and the upper gap is placed in alignment with the observation gap. A lower gap is formed between the two lower plugs, and the lower gap is placed in alignment with the observation gap.

[0010] Preferably, the lower positioning component includes a spline and a sliding groove. The spline is arranged on the inner side wall of the accommodation cavity, and the sliding groove is arranged on the outer peripheral wall of the lower die. The lower die can slide on the spline through the sliding groove. The sliding fit between the spline and the sliding groove enables the lower gap to be placed in alignment with the observation gap.

[0011] Preferably, a gap plug is provided on the upper end surface of the lower plug.

[0012] Preferably, the gap plug, the lower plug, and the upper plug are all arc-shaped. The centers of the gap plug and the lower plug coincide with the axis of the lower die. The center of the upper plug coincides with the axis of the upper die.

[0013] Preferably, a slot is provided inward on the outer peripheral wall of the lower part of the rotating shaft, and the slot penetrates the lower end surface of the rotating shaft. The flanging pressing wheels are arranged below the slot, and all the flanging pressing wheels are arranged at intervals around the slot. The flanging pressing wheels and the slot form an access space for the upper die to enter and exit. A shoulder is provided on the upper part of the upper die, and the slot can form a pre-pressure on the shoulder.

[0014] The beneficial effect of the present invention is that: a flanging machine for a magnetorheological piston assembly provided by the above technical solution uses spin riveting and flanging to fix the piston upper pressing plate and the piston lower pressing plate. While the reliability is guaranteed, it is more environmentally friendly and economical compared with welding.

[0015] Through the following description and in combination with the drawings, the present invention will become clearer. These drawings are used to explain the embodiments of the present invention. Description of the Drawings

[0016] Figure 1 Shown is a schematic structural diagram of a flanging machine for a magnetorheological piston assembly.

[0017] Figure 2 Shown is a separated schematic diagram after sectional view of a magnetorheological piston assembly and a positioning tooling structure.

[0018] Figure 3 Shown is a bottom view of the upper die.

[0019] Figure 4 Shown is a top view of the positioning sleeve seat.

[0020] Figure 5 Shown is a top view of the lower die.

[0021] Figure 6 Shown is a schematic structural diagram of the piston upper pressure plate. Detailed implementation manners

[0022] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0024] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0026] Reference Figures 1 to 6, a flanging machine for a magnetorheological piston assembly, comprising an assembly fixing device 500, a lifting drive device 510, a rotating shaft 520, and a rotating drive device 530. A plurality of flanging pressure wheels 540 are provided at the lower part of the rotating shaft 520. The rotating drive device 530 drives the rotating shaft 520 to rotate. The assembly fixing device 500 is arranged below the flanging pressure wheels 540. The assembly fixing device 500 is used to place the magnetorheological piston assembly. The lifting drive device 510 drives the assembly fixing device 500 to move away from or close to the flanging pressure wheels 540.

[0027] During use, first place the piston lower pressing plate 410 into the piston housing 430. There is a step inside the lower part of the piston housing 430 to form a lower pressing plate accommodating cavity. The piston lower pressing plate 410 is placed in the lower pressing plate accommodating cavity. The peripheral wall height of the lower part of the piston housing 430 protrudes compared to the piston lower pressing plate 410. The piston housing 430 is placed in the assembly fixing device 500. The lifting drive device 510 drives the assembly fixing device 500 to approach the flanging pressure wheels 540. The rotating drive device 530 drives the flanging pressure wheels 540 to rotate. The flanging pressure wheels 540 perform spin riveting flanging on the lower peripheral wall of the piston housing 430 to form a lower flanging 431, thereby flanging and fixing the piston lower pressing plate 410. Then, place the magnetic core 400 and the piston upper pressing plate 420 into the piston housing 430 one by one from top to bottom. At this time, the piston lower pressing plate 410 is fixedly installed at the bottom of the piston housing 430. Then, place the piston housing 430 into the assembly fixing device 500. The lifting drive device 510 drives the assembly fixing device 500 to approach the flanging pressure wheels 540. The rotating drive device 530 drives the flanging pressure wheels 540 to rotate. The flanging pressure wheels 530 perform spin riveting flanging on the upper peripheral wall of the piston housing 430 to form an upper flanging 432, thereby flanging and fixing the piston upper pressing plate 420. In the present invention, the piston lower pressing plate 410 and the piston upper pressing plate 420 are respectively flanged, so that the piston lower pressing plate 410, the magnetic core 400, and the piston upper pressing plate 420 can be fixed in the piston housing 430. While ensuring reliability, it is more environmentally friendly and economical compared to welding.

[0028] In one embodiment, it further includes a guiding device. The guiding device includes a mounting plate 512 and two guide rails 511. The assembly fixing device 500 is fixedly installed on the mounting plate 512. The two guide rails 511 are arranged vertically. The mounting plate 512 is slidably arranged on the two guide rails 511. The lifting drive device 510 drives the mounting plate 512 to move away from or close to the flanging pressure wheels 540. The assembly fixing device 500 is fixedly installed on the mounting plate 512. The mounting plate 512 is slidably arranged on the two guide rails 511. The lifting drive device 510 drives the mounting plate 512 to move vertically away from or close to the flanging pressure wheels 540.

[0029] In one embodiment, the lifting drive device 510 is provided with a lifting end, and the lifting end is fixedly connected to the lower end surface of the mounting plate 512; the assembly fixing device 500 is fixedly installed on the upper end surface of the mounting plate 512; the mounting plate 512 is L-shaped, and the side surface of the mounting plate 512 is slidably arranged on two guide rails 511. The mounting plate 512 is L-shaped, and the side surface of the mounting plate 512 is slidably arranged on two guide rails 511. The lifting drive device 510 can use a lifting motor for lifting drive, and the lifting drive device 510 drives the mounting plate 512 to vertically move away from or close to the flanging press wheel 540. The rotation drive device 530 can be driven by a motor.

[0030] In one embodiment, the assembly fixing device 500 includes a base and a positioning tooling. The positioning tooling is arranged on the base; the positioning tooling includes a positioning sleeve seat 100, an upper die 300 and a lower die 200. The positioning sleeve seat 100 is provided with a receiving cavity. The upper part of the receiving cavity is a piston assembly receiving cavity, and the lower part of the receiving cavity is used for placing the lower die 200. The top of the lower die 200 is provided with a lower plug 210; the bottom of the upper die 300 is provided with an upper plug 310; the positioning sleeve seat 100 is respectively provided with a lower positioning component and an upper positioning component for aligning the lower plug 210 and the upper plug 310. The positioning tooling is arranged on the base, and the base is installed on the mounting plate 512. When flanging the piston upper pressing plate 420, first insert the lower plug 210 into the lower through hole of the piston lower pressing plate 410, place the lower die 200 and the piston housing 430 into the piston assembly receiving cavity, and realize the positioning of the lower die 200 and the positioning sleeve seat 100 through the lower positioning component; then put the magnetic core 400 and the piston upper pressing plate 420 into the piston housing 430 one by one from top to bottom, place the upper through hole 421 of the piston upper pressing plate 420 opposite to the upper plug 310, and realize the positioning of the upper die 300 and the positioning sleeve seat 100 through the upper positioning component, so as to realize the positioning of the upper die 300, the positioning sleeve seat 100 and the lower die 200, and thus realize the vertical position alignment of the upper through hole 421 of the piston upper pressing plate 420 and the lower through hole of the piston lower pressing plate 410. When the existing magnetorheological assembly is produced, generally there is no positioning tooling to assist the vertical position alignment of the upper through hole 421 of the piston upper pressing plate 420 and the lower through hole of the piston lower pressing plate 410. The present invention uses the upper positioning component and the lower positioning component to realize the vertical position alignment of the upper through hole 421 of the piston upper pressing plate 420 and the lower through hole of the piston lower pressing plate 410. The receiving cavity is provided with an abutting step 110, and the upper part of the abutting step 110 is the piston assembly receiving cavity; the lower part of the abutting step 110 is used for placing the lower die 200. When processing, the abutting step 110 is machined in the receiving cavity, and the upper part of the abutting step 110 is the piston assembly receiving cavity.

[0031] In one embodiment, there are multiple lower plugs 210, and all the lower plugs 210 are arranged in a ring-shaped axisymmetric manner around the axis of the lower die 200; there are multiple upper plugs 310, and all the upper plugs 310 are arranged in a ring-shaped axisymmetric manner around the axis of the upper die 300; the number of the lower plugs 210 is the same as that of the upper plugs 310. The structure of the piston upper pressure plate 420 is similar to that of the piston lower pressure plate 410. The number of the upper through holes 421 in the piston upper pressure plate 420, the number of the lower through holes in the piston lower pressure plate 410, the number of the lower plugs 210 and the number of the upper plugs 310 are all the same. All the upper through holes 421 are arranged in an axisymmetric manner around the axis of the piston upper pressure plate 420, all the lower through holes are arranged in an axisymmetric manner around the axis of the piston lower pressure plate 410, and all the lower plugs 210 and all the upper plugs 310 are respectively arranged in an axisymmetric manner around the axis of the lower die 200 and the axis of the upper die 300, and the number of the lower plugs 210 is the same as that of the upper plugs 310. Therefore, during insertion, the upper plugs 310 are inserted into the upper through holes 421 of the piston upper pressure plate 420 one by one, and the lower plugs 210 are inserted into the lower through holes of the piston lower pressure plate 410 one by one.

[0032] In one embodiment, the upper positioning assembly includes an observation gap 130. The observation gap 130 is arranged on the outer peripheral wall of the upper part of the positioning sleeve seat 100. There is an upper gap 320 between the two upper plugs 310, and the upper gap 320 is placed in alignment with the observation gap 130; there is a lower gap 230 between the two lower plugs 210, and the lower gap 230 is placed in alignment with the observation gap 130. The observation gap 130 is arranged on the outer peripheral wall of the upper part of the positioning sleeve seat 100. There is an upper gap 320 between the two upper plugs 310, and the upper gap 320 is placed in alignment with the observation gap 130, so that the positioning of the upper die 300 and the positioning sleeve seat 100 can be realized. The lower gap 230 is placed in alignment with the observation gap 130 to realize the positioning of the lower die 200 and the positioning sleeve seat 100.

[0033] In one embodiment, the lower positioning assembly includes a spline 120 and a sliding groove 240. The spline 120 is arranged on the inner side wall of the accommodating cavity, the sliding groove 240 is arranged on the outer peripheral wall of the lower die 200, and the lower die 200 can slide on the spline 120 through the sliding groove 240; the sliding fit between the spline 120 and the sliding groove 240 enables the lower gap 230 to be placed in alignment with the observation gap 130. Since the lower die 200 needs to be placed into the accommodating cavity, it is relatively difficult to observe the alignment of the lower gap 230 and the observation gap 130. Therefore, a spline 120 is arranged on the inner side wall of the accommodating cavity, and a sliding groove 220 is arranged on the outer peripheral wall of the lower die 200. When placing the lower die 200, the sliding groove 220 is aligned with the spline 120, and the sliding fit between the spline 120 and the sliding groove 220 enables the lower gap 230 to be placed in alignment with the observation gap 130.

[0034] In one embodiment, a clearance plug 220 is provided on the upper end surface of the lower plug 210. An annular channel 440 is formed between the inner wall of the piston housing 430 and the outer wall of the magnetic core 400. When manufacturing the piston assembly, the magnetic core 400 is placed inside the piston housing 430. It is necessary to ensure that the magnetic core 430 is placed at the central position of the piston housing 430 without deviation, so as to ensure the consistency of the clearance of the annular channel 440 and achieve the consistency of the magnetorheological damping force. However, during the assembly production, there is no alignment tooling to ensure that the magnetic core 400 is placed at the central position of the piston housing 430 and the clearance of the annular channel 440 is consistent. The clearance plug 220 is provided on the upper end surface of the lower plug 210 of the present invention. The lower plug 210 on the lower mold 200 is inserted into the lower through hole of the piston lower pressing plate 410. At this time, the clearance plug 220 is also inserted into the annular channel 430. The width of the clearance plug 220 is slightly smaller than the width of the annular channel 430, and the widths of all the clearance plugs 220 are the same. Since all the clearance plugs 220 are symmetrically arranged on the upper end surface of the alignment mold 200 from left to right, and the clearance plug 220 matches the annular channel 430, the magnetic core 400 can be accurately placed at the central position of the piston housing 430, ensuring the consistency of the clearance of the annular channel 430.

[0035] In one embodiment, the clearance plug 220, the lower plug 210, and the upper plug 310 are all arc-shaped. The centers of the clearance plug 220 and the lower plug 210 coincide with the axis of the lower die 200; the center of the upper plug 310 coincides with the axis of the upper die 300. When machining the upper through-hole 421 of the piston upper pressing plate 420 and the lower through-hole of the piston lower pressing plate 410, they are generally machined into arc-shaped waist-shaped holes. The lower plug 210 and the upper plug 310 are both arc-shaped. The shape of the lower plug 210 matches the shape of the lower through-hole. The lower plug 210 is inserted into the lower through-hole, and its insertion is more stable; the shape of the upper plug 310 matches the shape of the upper through-hole 421. The upper plug 310 is inserted into the upper through-hole 421, and its insertion is more stable. The shapes and sizes of the lower through-hole of the piston lower pressing plate 410 and the upper through-hole 421 of the piston upper pressing plate 420 are the same, and the shapes and sizes of the lower plug 210 and the upper plug 310 are the same. The clearance plug 220 is arc-shaped. A plurality of clearance plugs 220 are evenly distributed in a ring to form a circle. The clearance plug 220 is inserted into the annular channel 430. The shape of the clearance plug 220 matches the shape of the annular channel 430, so that the magnetic core is accurately placed at the center position of the piston housing, ensuring that the gaps in the annular channel are consistent. The length and width of the clearance plug 220 are not greater than the length and width of the lower plug 210. The length, width, and shape of the lower plug 210 are the same as those of the lower through-hole. The lower plug 210 is inserted into the lower through-hole, and its insertion is more stable. The length and width of the clearance plug 220 are not greater than the length and width of the lower plug 210. When the clearance plug 220 is inserted into the lower through-hole, it can be ensured that the clearance plug 220 can pass through the lower through-hole smoothly. The outer peripheral walls of the lower plug 210 and the clearance plug 220 coincide with the outer peripheral wall of the lower die 200. The lower plug 210 on the lower die 200 is inserted into the lower through-hole of the piston lower pressing plate 410. Since the outer peripheral wall of the lower plug 210 coincides with the outer peripheral wall of the clearance plug 220, the clearance plug 220 is also inserted into the annular channel 430 at this time. The outer peripheral wall of the lower plug 210 coincides with the outer peripheral wall of the lower die 200, and the outer peripheral wall of the lower die 200 does not block the protruding part of the lower end face of the piston housing 430.

[0036] In one embodiment, a slot 521 is provided inwardly on the outer peripheral wall of the lower part of the rotating shaft 520, and the slot 521 penetrates the lower end face of the rotating shaft 520; the flanging press wheels 540 are arranged below the slot 521, and all the flanging press wheels 540 are arranged at intervals around the slot 521; the flanging press wheels 540 and the slot 521 surround to form an access space for the upper die 300 to enter and exit; a shoulder 330 is provided on the upper part of the upper die 300, and the slot 521 can form a pre-pressure on the shoulder 330. The flanging press wheels 540 and the slot 521 surround to form an access space, and the lifting drive device 510 drives the mounting plate 512 to move vertically away from or close to the flanging press wheels 540, and the upper die 300 can enter and exit this access space. When flanging the piston lower pressing plate 410, the shapes and sizes of the lower plug 210 and the upper plug 310 are the same, and the upper plug 310 of the upper die 300 can be inserted into the lower through hole of the piston lower pressing plate 410. The lifting drive device 510 drives the piston housing 430 to approach the flanging press wheels 540, and the upper die 300 enters the access space. The slot 521 can form a pre-pressure on the shoulder 330 to fix the upper die 300, thereby realizing the fixation of the piston lower pressing plate 410. The rotation drive device 530 drives the flanging press wheels 540 to rotate, and the flanging press wheels 530 perform spin riveting flanging on the lower peripheral wall of the piston housing 430 to form a lower flanging 431, thereby flanging and fixing the piston lower pressing plate 410. Similarly, when flanging the piston upper pressing plate 420, the slot 521 can form a pre-pressure on the shoulder 330 to fix the upper die 300, thereby realizing the fixation of the piston upper pressing plate 420. The rotation drive device 530 drives the flanging press wheels 540 to rotate, and the flanging press wheels 530 perform spin riveting flanging on the upper peripheral wall of the piston housing 430 to form an upper flanging 432, thereby flanging and fixing the piston upper pressing plate 420.

[0037] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A flanging machine for a magnetorheological piston assembly, characterized in that, It includes a total assembly fixing device, a lifting drive device, a rotating shaft, and a rotating drive device. A plurality of flanging pressing wheels are provided at the lower part of the rotating shaft. The rotating drive device drives the rotating shaft to rotate. The total assembly fixing device is arranged below the flanging pressing wheels and is used for placing the magnetorheological piston assembly. The lifting drive device drives the total assembly fixing device to move away from or close to the flanging pressing wheels.

2. The flanging machine for a magnetorheological piston assembly according to claim 1, characterized in that, It further includes a guiding device. The guiding device includes a mounting plate and two guide rails. The total assembly fixing device is fixedly mounted on the mounting plate. The two guide rails are vertically arranged, and the mounting plate is slidably arranged on the two guide rails. The lifting drive device drives the mounting plate to move away from or close to the flanging pressing wheels.

3. The flanging machine for a magnetorheological piston assembly according to claim 2, characterized in that, The lifting drive device is provided with a lifting end, and the lifting end is fixedly connected to the lower end surface of the mounting plate. The total assembly fixing device is fixedly mounted on the upper end surface of the mounting plate. The mounting plate is L-shaped, and the side surface of the mounting plate is slidably arranged on the two guide rails.

4. The flanging machine for a magnetorheological piston assembly according to claim 1, characterized in that, The total assembly fixing device includes a base and a positioning tooling. The positioning tooling is arranged on the base. The positioning tooling includes a positioning sleeve seat, an upper die, and a lower die. A receiving cavity is provided in the positioning sleeve seat. The upper part of the receiving cavity is a piston assembly receiving cavity, and the lower part of the receiving cavity is used for placing the lower die. A lower plug is provided at the top of the lower die. An upper plug is provided at the bottom of the upper die. Lower positioning components and upper positioning components for aligning the lower plug and the upper plug are respectively provided on the positioning sleeve seat.

5. The flanging machine for a magnetorheological piston assembly according to claim 4, characterized in that, There are multiple lower plugs, and all the lower plugs are axially symmetrically arranged around the axis of the lower die in a circular shape. There are multiple upper plugs, and all the upper plugs are axially symmetrically arranged around the axis of the upper die in a circular shape. The number of lower plugs is the same as the number of upper plugs.

6. The flanging machine for a magnetorheological piston assembly according to claim 5, characterized in that, The upper positioning component includes an observation gap. The observation gap is arranged on the outer peripheral wall of the upper part of the positioning sleeve seat. An upper gap is formed between the two upper plugs, and the upper gap is aligned with the observation gap for placement. A lower gap is formed between the two lower plugs, and the lower gap is aligned with the observation gap for placement.

7. The flanging machine for a magnetorheological piston assembly according to claim 6, characterized in that, The lower positioning component includes a spline and a chute. The spline is arranged on the inner side wall of the receiving cavity, and the chute is arranged on the outer peripheral wall of the lower die. The lower die can slide on the spline through the chute. The sliding cooperation between the spline and the chute enables the lower gap to be aligned with the observation gap for placement.

8. The flanging machine for a magnetorheological piston assembly according to claim 5, characterized in that, A gap plug is provided on the upper end surface of the lower plug.

9. The flanging machine for a magnetorheological piston assembly according to claim 8, characterized in that, The gap plug, the lower plug, and the upper plug are all arc-shaped. The centers of the gap plug and the lower plug coincide with the axis of the lower die. The center of the upper plug coincides with the axis of the upper die.

10. The flanging machine for a magnetorheological piston assembly according to claim 4, characterized in that, A slot is formed by the inward indentation of the outer peripheral wall at the lower part of the rotating shaft, and the slot penetrates the lower end surface of the rotating shaft. The flanging pressing wheels are arranged below the slot, and all the flanging pressing wheels are spaced around the slot. The flanging pressing wheels and the slot form an access space for the upper die to enter and exit. A shoulder is provided at the upper part of the upper die, and the slot can form a pre-pressure on the shoulder.

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