Magnetorheological polishing method for inner surface of spiral pipe

Abstract

The invention discloses a magneto-rheological polishing method for the inner surface of a spiral pipe, which comprises the following steps of: placing the spiral pipe at a driving end to realize autorotation, and adjusting a gap between adjacent magnets on a sliding rail table below the spiral pipe through each independent moving seat, so that the gap between the adjacent magnets is the spiral pipe lead; the spiral pipe starts to rotate slowly, the movable seat drives the magnets to move gradually from the right end to the negative direction of the X axis, and when the end face of a right pipe opening of the spiral pipe faces the positive direction of the Y axis, the first magnet comes to the position under the first ring of the pipe fitting; when the end face of the right pipe opening of the spiral pipe faces the positive direction of the Z axis, the magnetorheological polishing liquid is guided in. According to the polishing method ingenious in design, the spiral pipe is driven to rotate, the magneto-rheological polishing liquid is arranged in the spiral pipe, meanwhile, the magnet capable of horizontally moving is designed below the spiral pipe and synchronously moves along with rotation of the spiral pipe, and therefore the magneto-rheological polishing liquid can fully polish the whole inner wall of the spiral pipe.

Description

Technical Field

[0001] The invention relates to the technical field of spiral pipe processing, in particular to a magnetorheological polishing method for the inner surface of a spiral pipe. Background Art

[0002] Spiral pipe fittings are a type of pipe fitting structure formed by spiral lines around the central axis. They are widely used in defense, military, aerospace, medical equipment, automobile manufacturing and other industries, and have good market prospects and competitive advantages. As a carrier for conveying gas or liquid, spiral pipe fittings should have a high surface quality, which should not only ensure smooth conveying and uniform pressure, but also avoid pollution and corrosion caused by surface defects that reduce the service life. This puts forward more stringent requirements on the ultra-precision processing technology of the inner surface of spiral pipes. It is difficult to polish the inner surface of spiral pipes using traditional methods. The reason is that traditional rigid tools such as grinding wheels and polishing grinding heads are difficult to complete the grinding of the inner surface of the bent pipe due to the difficulty of penetration or interference.

[0003] This case was created to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a method for magnetorheological polishing of the inner surface of a spiral tube, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented by the following technical solutions: a method for magnetorheological polishing of the inner surface of a spiral tube, wherein the inner wall of the spiral tube includes an outer tube wall and an inner tube wall, and polishing is achieved by device one and device two, comprising the following steps:

[0008] The outer wall of the spiral tube is polished in device 1.

[0009] S1. Place the spiral tube at the driving end to realize self-rotation, and adjust the gap between adjacent magnets on the slide platform below the spiral tube through each independent moving seat so that the gap between adjacent magnets is the lead of the spiral tube;

[0010] S2, the preparation stage, the spiral tube starts to rotate slowly, and the moving seat drives the magnet to gradually move from the right end to the negative direction of the X axis. When the right end face of the spiral tube faces the positive direction of the Y axis, the first magnet is driven to the bottom of the first circle of the pipe fitting; at this time, the spiral tube continues to rotate, and the moving seat continues to move in the negative direction of the X axis. When the right end face of the spiral tube faces the positive direction of the Z axis, the abrasive liquid is introduced and falls into the end of the first circle of the spiral tube, thus completing the preparation stage of the first magnet, and the corresponding preparation of the next two magnets is completed in the same way;

[0011] S3, polishing stage, the time for the spiral tube to rotate one circle is equal to the time for the slide table to move one lead. When the first magnet moves to the left end face of the spiral tube, the spiral tube is reversed and the moving seat is moved in the opposite direction until it returns to the starting stage of polishing, completing a complete polishing, and the operation is repeated;

[0012] The inner wall of the spiral tube is polished in the second device.

[0013] S4, inner tube wall polishing stage, take out the spiral tube in step 3 and place it into the slots at the upper and lower turntables, the upper and lower turntables are adjusted by a screw and a bolt to clamp the spiral tube, then the limit seat is horizontally inserted into the machine table, and at the same time, the slide table is horizontally moved into the spiral tube and the block is stuck in the slot, repeat steps 2-3 to complete the polishing of the inner wall of the spiral tube.

[0014] As a preferred solution, further, the moving seat moves synchronously with the rotation of the spiral tube, and always keeps one magnet corresponding to one circle of the spiral tube.

[0015] As a preferred solution, further, in step S3, the movable seat needs to make an extra 1 / 4 turn at the end of one reverse movement.

[0016] An application device of a magnetorheological polishing method for the inner surface of a spiral tube, wherein the first device comprises a machine platform, a motor as a driving end is provided on the side of the machine platform, a rotating shaft is connected to the output end of the motor, the outer periphery of the rotating shaft can be placed in the spiral tube, the rotating shaft is arranged horizontally and penetrates to the other side along the axial direction, a plurality of slots communicating with the interior are opened in the axial direction of the rotating shaft, and an air bag is provided inside, which gradually expands from the slot after air is supplied to the air bag to limit and support the spiral tube on the periphery, a slide rail platform is provided below the spiral tube, a plurality of independent movable seats are slidably connected to each other at intervals on the slide rail platform, and a magnet is placed on the upper side of each movable seat.

[0017] As a preferred solution, further, a limit seat is installed at the end of the rotating shaft, and a stop block is installed at the inner end of the limit seat. After the limit seat is installed, the stop block abuts against the end of the spiral tube.

[0018] As a preferred embodiment, further, the second device includes a machine table, a motor as a driving end is provided on the side of the machine table, and the output end of the motor is connected to an upper turntable and a lower turntable that are independent of each other, wherein the upper turntable and the lower turntable are respectively connected with connecting blocks on both sides, and the two connecting blocks are connected and fixed to each other by a screw and a bolt, wherein the outer side openings of the upper turntable and the lower turntable are provided with slots, and a spiral tube can be inserted into the slots; the machine table is located at the other side end of the upper turntable and the lower turntable, and a limit seat is inserted into the inner side end of the limit seat, and the stopper can be inserted into the two slots to form a whole, and the limit seat and the stopper are axially provided with through grooves, and a horizontal slide rail platform is installed in the through groove, and a movable seat is slidably connected to the slide rail platform at intervals, and a magnet is placed on the lower side of the movable seat, wherein the slide rail platform is located at the horizontal central axis of the spiral tube.

[0019] As a preferred solution, further, the output end of the motor is connected to an extension block, a long slot is provided on the extension block, and corresponding sides of the upper rotating seat and the lower rotating seat are connected to screw rod 2, which passes through the long slot and is fixed by bolts.

[0020] (III) Beneficial effects

[0021] After adopting the above technical solution, the magnetorheological polishing method for the inner surface of a spiral tube provided by the present invention has the following beneficial effects compared with the prior art:

[0022] By designing a simple driving structure and an ingenious polishing method, the spiral tube is driven to rotate, and magnetorheological polishing liquid is placed in the spiral tube. At the same time, a horizontally movable magnet is designed under the spiral tube, which moves synchronously with the rotation of the spiral tube, so that the polishing liquid can fully polish the entire inner wall of the spiral tube, thereby efficiently removing dirt and rust from the inner wall of the irregular spiral tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a device of the present invention;

[0024] Figure 2 This is a disassembly schematic diagram of a device of the present invention;

[0025] Figure 3 This is a schematic diagram of an improved device of the present invention;

[0026] Figure 4 It is a front view of the device of the present invention;

[0027] Figure 5 This is a schematic diagram of the second device of the present invention;

[0028] Figure 6 This is a disassembly diagram of the second device of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the second clamping part of the device of the present invention.

[0030] In the figure, 1, machine table; 2, motor; 3, rotating shaft; 4, limit seat; 5, extension seat; 6, through hole; 7, slot; 8, plug-in block; 9, spiral tube; 10, feed port; 11, notch; 12, slide rail table; 13, moving seat; 14, magnet; 15, stopper. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0032] See attached Figure 1-2 As shown, a device used in a method for magnetorheological polishing of the inner surface of a spiral tube includes a device 1 and a device 2. The device 1 includes a machine 1, and a motor 2 as a driving end is provided on the side of the machine 1. The output end of the motor 2 is connected to a rotating shaft 3, and the outer periphery of the rotating shaft 3 can be placed in a spiral tube 9. The rotating shaft 3 is arranged horizontally and penetrates to the other side along the axial direction. A plurality of notches 11 communicating with the interior are opened in the axial direction of the rotating shaft 3, and an air bag is provided inside. The notches 11 are gradually expanded by passing air through the lateral air bag to limit and support the outer spiral tube 9, so that the spiral tube 9 can rotate with the rotating shaft 3.

[0033] A slide platform 12 is provided below the spiral tube 9, on which movable seats 13 are slidably connected at intervals (each movable seat 13 is independently slidably connected to the slide platform 12, and can slide independently along the slide platform 12 through conventional mechanisms such as matching motors and pulleys), and a magnet 14 is arranged on the upper side of the movable seat 13.

[0034] See attached Figure 3 As shown, considering that the spiral tube 9 is prone to axial deviation during rotation, a limit seat 4 is installed at the end of the rotating shaft 3, and a stop block 15 is installed at the inner end of the limit seat 4 to abut the end of the spiral tube 9 to prevent it from moving outward due to inertia.

[0035] The limit seat 4 is a movable connection type, so that the preceding spiral tube 9 can be placed. Specifically, an insert block 8 is installed at the bottom of the limit seat 4, a slot 7 is opened at the corresponding position of the machine 1, and the inner side end of the limit seat 4 is connected to an extension seat 5 and plugged into the rotating shaft 3. Secondly, a through hole 6 is axially opened in the limit seat 4 and the extension seat 5, and communicates with the rotating shaft 3.

[0036] The upper surface of the magnet is close to the bottom of the spiral tube and extends in a plane (compared with convex, concave and other surface shapes, its additional magnetism is greater).

[0037] See attached Figure 5-7As shown, the structure of the device 2 is basically the same as that of the device 1, except for the part for clamping the spiral tube 9 and the switching of the position of some structures. The device 2 includes a machine table 1, and a motor 2 as a driving end is provided on the side of the machine table 1. The output end of the motor 2 is connected to an upper rotating seat 16 and a lower rotating seat 17 that are independent of each other, wherein the upper rotating seat 16 and the lower rotating seat 17 are respectively connected to connecting blocks 18 on both sides, and the two connecting blocks 18 are connected and fixed to each other by screws 19. The outer sides of the upper rotating seat 16 and the lower rotating seat 17 are provided with slots 22, and the spiral tube 9 can be placed in the slots 22. After the spiral tube 9 is placed, the distance between the upper rotating seat 16 and the lower rotating seat 17 is adjusted to clamp the spiral tube 9.

[0038] The other end of the machine table 1 located at the upper rotating seat 16 and the lower rotating seat 17 is plugged with a limit seat 4, and a stopper 15 is installed on the inner side end of the limit seat 4, and the stopper 15 can be inserted into the two notches 22 to form a whole, and a through groove 23 is axially opened in the limit seat 4 and the stopper 15, and a horizontal slide table 12 is installed in the through groove 23, and the slide table 12 is slidably connected with movable seats 13 at intervals (each movable seat 13 is independently slidably connected to the slide table 12, and the movable seat 13 can be realized by conventional driving methods / mechanisms such as matching motors, cylinders, pulleys, etc. The movable seat 13 slides independently along the slide table 12), and a magnet 14 is placed on the lower side of the movable seat 13 (it should be noted that before processing, it is better to set the position where the magnet is placed as close as possible to the upper outer tube wall of the spiral tube that rotates downward--please refer to the attached Figure 6 The slide rail platform 12 is located at the horizontal center axis of the spiral tube 9.

[0039] Since the positions of the upper rotating seat 16 and the lower rotating seat 17 need to be adjusted, an extension block 20 is connected to the output end of the motor 2, and a long groove is opened on the extension block 20. The corresponding sides of the upper rotating seat 16 and the lower rotating seat 17 are connected with screw rod 21, and the screw rod 21 passes through the long groove and is fixed by bolts, so as to achieve the tightening of the upper rotating seat 16 and the lower rotating seat 17 after the position is adjusted.

[0040] Combined with Figure 1-7 As shown, a magnetorheological polishing method for the inner surface of a spiral tube 9 is provided. The inner wall polishing of the spiral tube includes the outer tube wall and the inner tube wall (close to the axial tube side), and is realized by means of device 1 and device 2.

[0041] The following steps are involved:

[0042] The outer wall of the spiral tube is polished in device 1.

[0043] 1. Place the spiral tube 9 on the periphery of the rotating shaft 3 and tighten it in a limited position. Adjust the gap between adjacent magnets 14 on the slide rail platform 12 through the respective movable seats 13 so that the gap between adjacent magnets 14 is the lead of the spiral tube 9;

[0044] 2. The spiral tube 9 starts to rotate slowly, and the moving seat 13 drives the magnet 14 to gradually move from the right end to the negative direction of the X-axis. When the right end face of the spiral tube 9 faces the positive direction of the Y-axis, the lower part just passes through the No. ① magnet 14; the spiral tube 9 continues to rotate, and the moving seat 13 continues to move to the negative direction of the X-axis. When the right end face of the spiral tube 9 faces the positive direction of the Z-axis, the feeding mechanism outputs the magnetorheological polishing liquid, which falls into the first circle end of the spiral tube 9, thus completing the preparation stage of the first magnet 14, and the next two magnets 14 complete the corresponding preparation in the same way;

[0045] 3. During the outer tube wall polishing stage, the time for the spiral tube 9 to rotate one circle is equal to the time for the moving seat 13 to move one lead. When the No. ① magnet 14 moves to the left end face of the spiral tube 9, the spiral tube 9 reverses and the moving seat 13 moves in the opposite direction until it returns to the starting stage of polishing. At this point, a complete polishing is completed. It should be noted that at the end of a reverse stroke, it is necessary to rotate 1 / 4 more circle (because at the beginning of the polishing stage, the inner wall of the spiral tube 9 in this section is not polished). This is repeated for several minutes.

[0046] The inner wall of the spiral tube is polished in the second device.

[0047] 4. In the inner tube wall polishing stage, the spiral tube 9 in step 3 is taken out and placed in the slots 22 at the upper turntable 16 and the lower turntable 17. The upper turntable 16 and the lower turntable 17 are adjusted by screw rod 19 bolts to clamp and fix the spiral tube 9. Then the limit seat 4 is horizontally inserted into the machine table 1. At the same time, the slide rail table 12 is horizontally moved into the spiral tube 9 and the stopper 15 is stuck in the slot 22. Repeat steps 2-3 to complete the polishing of the inner wall of the spiral tube 9.

[0048] Due to the loss of abrasive in the magnetorheological polishing fluid, the magnetorheological polishing fluid is recycled and renewed. When the movable seat 13 exits the processing area, the magnetorheological polishing fluid can be received by an external guide groove and returned to the magnetorheological polishing fluid storage tank, and the magnetorheological polishing fluid can be re-pumped into the magnetorheological polishing fluid when the magnet 14 platform enters the processing area.

[0049] The moving seat 13 below moves synchronously with the rotation of the spiral tube 9, and always keeps one magnet 14 corresponding to one circle of the spiral tube 9. The bottom of each circle of the spiral tube 9 and the magnet 14 corresponding to the bottom attract each other. When the spiral tube 9 rotates, the internal magnetorheological polishing liquid is driven circle by circle to achieve the purpose of polishing the entire inner tube wall. When the moving seat 13 moves to the right end face of the spiral tube 9, the spiral tube 9 reverses, and the moving seat 13 moves in the opposite direction at the same time. When the platform moves to the right end face of the spiral tube 9, it reverses again, and the platform moves in the opposite direction at the same time, and repeats in sequence.

[0050] When the first magnet 14 enters the processing area, an appropriate amount of magnetorheological polishing liquid is added from the upper feeding pipe; when the second magnet 14 enters the processing area, an appropriate amount of magnetorheological polishing liquid is added in the same way. The feeding time interval is the rotation period of the pipe, and the feeding time and feeding amount are controlled by the automatic control system to ensure that a certain amount of magnetorheological polishing liquid is adsorbed on the bottom of the pipe above each magnet 14.

[0051] The magnetorheological polishing liquid is not only present at the bottom of the pipe, but also adsorbed on the entire inner wall section, so that the spiral tube 9 can polish the inner wall of the pipe in all directions during the self-rotation polishing. Secondly, the magnetorheological polishing liquid in the spiral tube 9 can also be quickly recovered with the help of the magnet 14.

[0052] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific 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. A method for magnetorheological polishing of the inner surface of a spiral tube, wherein the inner wall of the spiral tube includes an outer tube wall and an inner tube wall, and polishing is achieved by means of device 1 and device 2, characterized in that: The steps include: The outer wall of the spiral tube is polished in device 1. S1. Place the spiral tube at the driving end to realize self-rotation, and adjust the gap between adjacent magnets on the slide platform below the spiral tube through each independent moving seat so that the gap between adjacent magnets is the lead of the spiral tube; S2, the preparation stage, the spiral tube starts to rotate slowly, and the moving seat drives the magnet to gradually move from the right end to the negative direction of the X-axis. When the right end face of the spiral tube faces the positive direction of the Y-axis, the first magnet is driven to the bottom of the first circle of the pipe fitting; at this time, the spiral tube continues to rotate, and the moving seat continues to move in the negative direction of the X-axis. When the right end face of the spiral tube faces the positive direction of the Z-axis, the magnetorheological polishing liquid is introduced and falls into the end of the first circle of the spiral tube, thus completing the preparation stage of the first magnet, and the corresponding preparations of the next two magnets are completed in the same way; S3, polishing stage, the time for the spiral tube to rotate one circle is equal to the time for the slide table to move one lead. When the first magnet moves to the left end face of the spiral tube, the spiral tube is reversed and the moving seat is moved in the opposite direction until it returns to the starting stage of polishing, completing a complete polishing, and the operation is repeated; The inner wall of the spiral tube is polished in the second device. S4, inner tube wall polishing stage, take out the spiral tube in step 3 and place it into the slots at the upper and lower turntables, the upper and lower turntables are adjusted by a screw and a bolt to clamp the spiral tube, then the limit seat is horizontally inserted into the machine table, and at the same time, the slide table is horizontally moved into the spiral tube and the block is stuck in the slot, repeat steps 2-3 to complete the polishing of the inner wall of the spiral tube.

2. According to claim 1, a method for magnetorheological polishing of the inner surface of a spiral tube is characterized by: In step S3, the movable seat makes one more turn of 1 / 4 circle at the end of one reverse movement.

3. According to claim 1, a method for magnetorheological polishing of the inner surface of a spiral tube is characterized in that: The moving seat moves synchronously with the rotation of the spiral tube, and always keeps one magnet corresponding to one circle of the spiral tube.

4. An application device of the magnetorheological polishing method for the inner surface of a spiral tube according to any one of claims 1 to 3, characterized in that: Device 1 includes a machine platform, a motor as a driving end is provided on the side of the machine platform, a rotating shaft is connected to the output end of the motor, a spiral tube can be placed on the periphery of the rotating shaft, the rotating shaft is arranged horizontally and penetrates axially to the other side, a plurality of slots communicating with the interior are opened axially of the rotating shaft, and an air bag is provided inside, which gradually expands from the slot after air is supplied to the air bag to limit and support the spiral tube on the periphery, a slide rail platform is provided below the spiral tube, a plurality of independent moving seats are slidably connected to each other at intervals on the slide rail platform, and a magnet is placed on the upper side of each of the moving seats.

5. The application device of the magnetorheological polishing method for the inner surface of a spiral tube according to claim 4, characterized in that: A limiting seat is installed at the end of the rotating shaft, and a stopper is installed at the inner end of the limiting seat. After the limiting seat is installed, the stopper abuts against the end of the spiral tube.

6. The application device of the magnetorheological polishing method for the inner surface of a spiral tube according to claim 4, characterized in that: The upper surface of the magnet is close to the bottom of the spiral tube, and the upper surface is flat.

7. The application device of the magnetorheological polishing method for the inner surface of a spiral tube according to claims 1-3, characterized in that: The second device includes a machine table, a motor as a driving end is provided on the side of the machine table, and the output end of the motor is connected to an upper rotating seat and a lower rotating seat that are independent of each other, wherein the upper rotating seat and the lower rotating seat are respectively connected with connecting blocks on both sides, and the two connecting blocks are connected and fixed to each other by a screw and a bolt, wherein the outer side openings of the upper rotating seat and the lower rotating seat are provided with slots, and a spiral tube can be placed in the slots; the machine table is located at the other side end of the upper rotating seat and the lower rotating seat, and a limit seat is inserted into the inner side end of the limit seat, and the block can be inserted into the two slots to form a whole, and the limit seat and the block are axially provided with through grooves, and a horizontal slide rail platform is installed in the through groove, and a moving seat is slidably connected to the slide rail platform at intervals, and a magnet is placed on the lower side of the moving seat, wherein the slide rail platform is located at the horizontal central axis of the spiral tube.

8. The device for applying the magnetorheological polishing method for the inner surface of a spiral tube according to claim 7, characterized in that: The output end of the motor is connected to an extension block, a long slot is provided on the extension block, and corresponding sides of the upper rotating seat and the lower rotating seat are connected to screw rod 2, which passes through the long slot and is fixed by bolts.

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