A cutting and polishing device for stainless steel pipe fittings and method of use

Abstract

The present application relates to the technical field of stainless steel pipe fitting processing, and particularly relates to a cutting and polishing device for stainless steel pipe fittings and a use method, which comprises a bottom plate, a mounting base is fixedly arranged at the upper end of the bottom plate, a driving structure is arranged on the mounting base, the driving structure comprises a fixed plate which is used for mounting pipe fittings and can move in a U shape, the pipe fittings on the fixed plate can be cut vertically in the vertical direction and then polished in multiple directions under the limitation of the U-shaped movement track, an adjusting structure which can be fixed according to different pipe diameters is arranged on the fixed plate, a mounting plate which is fixedly arranged with the bottom plate is arranged opposite to the mounting base, a cutting wheel and a polishing wheel which can be driven synchronously are arranged on the mounting plate, and the problems that in the prior art, when single horizontal polishing is performed, the cutting traces of abrasive materials (such as sandpaper and grinding wheels) are distributed along the horizontal direction of the pipe fittings, parallel strip-shaped lines are formed, and the directional lines cause uneven surface reflection and poor visual effect are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe processing technology, and in particular to a cutting and grinding device and its usage method for stainless steel pipes. Background Technology

[0002] Stainless steel pipe is a hollow, long, round steel material, widely used in industrial pipelines for petroleum, chemical, medical, food, light industry, and machinery, as well as mechanical structural components. Furthermore, it is lighter in weight while maintaining the same bending and torsional strength, making it widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used in furniture and kitchenware. The production and processing of stainless steel pipes involves cutting and grinding.

[0003] However, after cutting stainless steel pipe fittings, they are usually polished in a horizontal direction. Polishing in a single horizontal direction is only suitable for the initial cleaning of simple straight pipes. When polishing the cut pipe opening in a single horizontal direction, the cutting marks of the abrasive (such as sandpaper or grinding wheel) will be concentrated along the horizontal direction of the pipe fitting, forming parallel stripes. This directional pattern will cause uneven surface reflection and poor visual effect. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a cutting and grinding device and method for stainless steel pipe fittings. This invention effectively solves the problem that in the prior art, when grinding in a single horizontal direction, the cutting marks of abrasive (such as sandpaper or grinding wheel) will be concentrated along the horizontal direction of the pipe fitting, forming parallel strip-like patterns. Such directional patterns will lead to uneven surface reflection and poor visual effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cutting and grinding device for stainless steel pipe fittings includes a base plate, with a mounting base fixedly mounted on the upper end of the base plate. A driving structure is mounted on the mounting base, comprising a fixed plate that mounts the pipe fitting and allows for U-shaped movement. The pipe fitting on the fixed plate can be vertically cut and then ground in multiple directions within the limited U-shaped movement trajectory. The fixed plate has an adjustment structure that can be adjusted according to different pipe fitting diameters. Opposite the mounting base is a mounting plate fixedly mounted to the base plate, and the mounting plate has a cutting wheel and a grinding wheel that can rotate synchronously.

[0007] Preferably, the drive structure further includes a support plate fixedly mounted on the base plate, a second motor mounted on the upper end of the support plate, a rotating rod fixedly connected to the output end of the second motor, and a support rod rotatably connected to one end of the rotating rod.

[0008] Preferably, a sliding plate is slidably connected to the mounting base, and each end of the sliding plate is provided with a sliding pin that limits sliding against the inner wall of the mounting base. One end of the support rod is rotatably connected to one end of the sliding plate.

[0009] Preferably, the slide plate has a V-shaped groove, the mounting base has a U-shaped groove that matches the V-shaped groove, a pin block is slidably connected to the inner wall of the U-shaped groove, a pin rod is slidably installed at one end of the pin block in the V-shaped groove, a mounting plate is fixedly connected to one end of the pin rod, and the fixing plate is fixedly connected to the mounting plate.

[0010] Preferably, the adjustment structure includes a fixed plate, with a first side plate and a second side plate fixedly connected to both ends of the fixed plate, a lead screw rotatably connected to the first side plate and the second side plate, a first slider and a second slider respectively provided at both ends of the lead screw, a screw cylinder threaded to the lead screw fixedly connected to the inner wall of the first slider and the second slider, and a pressure rod rotatably connected to both ends of the first slider and the second slider, with the lower end of the pressure rod rotatably mounted on a pressure plate that is slidably connected to the opposite surface of the first side plate and the second side plate.

[0011] Preferably, a lower mounting block is installed at the upper end of the fixing plate, and an upper mounting block corresponding to the lower mounting block is installed at the lower end of the pressure plate.

[0012] Preferably, a mounting plate fixedly connected to the base plate is provided opposite the mounting base. A first motor is mounted on the mounting plate, and a first rotating column rotatably connected to the mounting plate is mounted on the output end of the first motor. A driving pulley and a cutting wheel are fixedly mounted on the first rotating column. A driven pulley is connected to the driving pulley. A second rotating column rotatably connected to the mounting plate is fixedly connected to the driven pulley. A grinding wheel corresponding to the cutting wheel is mounted on the second rotating column.

[0013] Preferably, the upper end of the V-groove is at the same height as the upper end of the U-groove parallel section.

[0014] A method for using a cutting and grinding device for stainless steel pipe fittings includes the following steps:

[0015] Step 1: Control and adjust the operation of the structure. Based on the diameter of the stainless steel pipe fitting, use the upper and lower mounting blocks to fix the stainless steel pipe fitting onto the fixed plate.

[0016] Step 2: Control the cutting wheel and grinding wheel to work synchronously;

[0017] Step 3: Control the drive structure to work. Under the action of the V-shaped groove on the slide plate and the U-shaped groove on the mounting base, the fixed plate drives the stainless steel pipe to move from bottom to top, and uses the cutting wheel to cut the pipe.

[0018] Step 4: After cutting the pipe with the cutting wheel, the pipe moves to the top of the V-groove and then moves horizontally parallel to the upper end of the U-groove. The pipe is then ground horizontally with the grinding wheel. When the pipe moves to one end of the U-groove, it continues to move downwards and is ground vertically with the grinding wheel.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] After the pipe moves, it moves horizontally parallel to the middle of the U-shaped trajectory, using a grinding wheel to grind the pipe in the horizontal direction. When the pipe moves to one end of the U-shaped trajectory, it continues to move downward, using a grinding wheel to grind the pipe in the vertical direction. Horizontal grinding mainly acts on the circumferential surface or axial direction of the pipe, which can eliminate longitudinal scratches and protrusions on the surface. Up and down movement can cover areas missed by horizontal grinding, especially dead corners such as the curvature changes and interface corners of the pipe. After the two movements are superimposed, the contact between the abrasive and the surface of the pipe is more comprehensive, avoiding the problems of stripes or local over-grinding caused by grinding in one direction, and making the surface roughness more uniform. Attached Figure Description

[0021] Figure 1 This is an isometric view of a cutting and grinding device for stainless steel pipe fittings according to the present invention;

[0022] Figure 2 This is a front view of a cutting and grinding apparatus for stainless steel pipe fittings according to the present invention;

[0023] Figure 3 This is a schematic diagram of the V-shaped groove on the slide plate of a cutting and grinding device for stainless steel pipe fittings according to the present invention;

[0024] Figure 4 This is a schematic diagram of the U-shaped groove on the mounting base of a stainless steel pipe cutting and grinding device according to the present invention.

[0025] Figure 5 This is a schematic diagram of the adjustment structure of a cutting and grinding device for stainless steel pipe fittings according to the present invention.

[0026] Figure 6 This is a schematic diagram of the upper mounting block of a cutting and grinding device for stainless steel pipe fittings according to the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the second side plate of a cutting and grinding device for stainless steel pipe fittings according to the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of the mounting plate of a cutting and grinding device for stainless steel pipe fittings according to the present invention;

[0029] Figure 9This is a schematic diagram of the driving pulley and driven pulley of a cutting and grinding device for stainless steel pipe fittings according to the present invention;

[0030] In the diagram: 1. Base plate, 2. Mounting plate, 3. First motor, 4. Support plate, 5. Second motor, 6. Rotating rod, 7. Support rod, 8. Slide plate, 9. Sliding pin, 10. Mounting base, 11. V-groove, 12. U-groove, 13. Pin block, 14. Pin rod, 15. Mounting plate, 16. Fixing plate, 17. First side plate, 18. Rotating handle, 19. First slider, 20. Lead screw, 21. Screw barrel, 22. Second slider, 23. Pressure rod, 24. Pressure plate, 25. Lower mounting block, 26. Pipe fitting, 27. Upper mounting block, 28. Grinding disc, 29. Cutting wheel, 30. Drive pulley, 31. First rotating column, 32. Transmission belt, 33. Driven pulley, 34. Second rotating column, 35. Second side plate. Detailed Implementation

[0031] like Figure 1-9 As shown, a cutting and grinding device for stainless steel pipe fittings includes a base plate 1, with a mounting base 10 fixedly mounted on the upper end of the base plate 1. The mounting base 10 is provided with a driving structure, which includes a fixed plate 16 for mounting pipe fittings 26 and capable of U-shaped movement. The pipe fittings 26 on the fixed plate 16 can be vertically cut and then ground in multiple directions under the limitation of the U-shaped movement trajectory. The fixed plate 16 is provided with an adjustment structure that can be fixed according to different pipe fitting diameters 26. Opposite the mounting base 10, there is a mounting plate 2 fixedly mounted to the base plate 1. The mounting plate 2 is provided with a cutting wheel 29 and a grinding wheel 28 that can be driven synchronously.

[0032] In use, the invention controls the adjustment structure to operate. Based on the diameter of the stainless steel pipe fitting 26, the stainless steel pipe fitting 26 is fixedly mounted on the fixing plate 16. The cutting wheel 29 and the grinding wheel 28 are controlled to work synchronously. The drive structure is also controlled to operate, causing the fixing plate 16 to move the stainless steel pipe fitting 26 from bottom to top. The cutting wheel 29 cuts the pipe fitting 26. After cutting, the pipe fitting 26 moves horizontally parallel to the middle of the U-shaped trajectory. The grinding wheel 28 then grinds the pipe fitting 26 horizontally. When the pipe 26 moves to one end of the U-shaped trajectory, it continues to move downwards, using the grinding wheel 28 to grind the pipe 26 in the vertical direction. The horizontal grinding mainly acts on the circumferential surface or axial direction of the pipe 26, which can eliminate longitudinal scratches and protrusions on the surface. The up-and-down movement can cover the areas missed by the horizontal grinding, especially the dead corners such as the curvature change and the interface corner of the pipe 26. After the two movements are superimposed, the contact between the abrasive and the surface of the pipe 26 is more comprehensive, avoiding the problems of stripes or local over-grinding caused by grinding in one direction, and making the surface roughness more uniform.

[0033] The drive structure also includes a support plate 4 fixedly mounted on the base plate 1. A second motor 5 is mounted on the upper end of the support plate 4. A rotating rod 6 is fixedly connected to the output end of the second motor 5. A support rod 7 is rotatably connected to one end of the rotating rod 6.

[0034] like Figure 1 and 3 As shown, the support plate 4 serves to mount the second motor 5. When the second motor 5 is working, it drives the rotating rod 6 to rotate, and the rotating rod 6 drives the support rod 7 to deflect.

[0035] A slide plate 8 is slidably connected to the mounting base 10. Both ends of the slide plate 8 are respectively provided with sliding pins 9 that limit sliding with the inner wall of the mounting base 10. One end of the support rod 7 is rotatably connected to one end of the slide plate 8.

[0036] like Figure 1 As shown, during the deflection process, the support rod 7 drives the slide plate 8 to slide along the inner wall of the mounting base 10 under the action of the sliding pin 9.

[0037] The slide plate 8 has a V-shaped groove 11, and the mounting base 10 has a U-shaped groove 12 that matches the V-shaped groove 11. A pin block 13 is slidably connected to the inner wall of the U-shaped groove 12. A pin rod 14 is slidably installed in the V-shaped groove 11 at one end of the pin block 13. A mounting plate 15 is fixedly connected to one end of the pin rod 14. The fixing plate 16 is fixedly connected to the mounting plate 15.

[0038] like Figure 2-4 As shown, during the sliding process, the V-groove 11 drives the pin block 13 at one end of the pin rod 14 to move upward along the vertical groove section of the U-groove 12. When the top of the V-groove 11 moves to the top of the vertical groove section of the U-groove 12, the pin rod 14 drives the pin block 13 to move horizontally along the horizontal groove section of the U-groove 12. When the pin rod 14 moves to the vertical groove section at the other end of the U-groove 12, the pin block 13 moves vertically downward, thereby realizing the motion trajectory of the fixing plate 16 on the mounting plate 15 moving vertically upward, horizontally, and vertically downward.

[0039] The adjustment structure includes a fixed plate 16, with a first side plate 17 and a second side plate 35 fixedly connected to both ends of the fixed plate 16. A lead screw 20 is rotatably connected to the first side plate 17 and the second side plate 35. A first slider 19 and a second slider 22 are respectively provided at both ends of the lead screw 20. A screw cylinder 21 threadedly engaged with the lead screw 20 is fixedly connected to the inner walls of the first slider 19 and the second slider 22. A pressure rod 23 is rotatably connected to both ends of the first slider 19 and the second slider 22. The lower ends of the pressure rods 23 are rotatably mounted on a pressure plate 24 that is slidably connected to the opposite surfaces of the first side plate 17 and the second side plate 35.

[0040] like Figure 5 and 7 As shown, a handle 18 is provided at one end of the lead screw 20. The handle 18 drives the lead screw 20 to rotate. During the rotation, the lead screw 20 engages with the screw cylinder 21 inside the first slider 19 and the second slider 22 respectively, thereby realizing the opposite movement of the first slider 19 and the second slider 22. When the first slider 19 and the second slider 22 move towards the center, they drive the pressure rod 23 to press down. The pressure rod 23 drives the pressure plate 24 to move downward. The distance of the pressure plate 24 pressing down can be controlled according to the diameter of the pipe fitting 26.

[0041] The upper end of the fixing plate 16 is equipped with a lower mounting block 25, and the lower end of the pressure plate 24 is equipped with an upper mounting block 27 corresponding to the lower mounting block 25.

[0042] like Figure 5 and 6 As shown, the pipe fitting 26 can be placed in the inner groove of the lower mounting block 25. During the downward movement of the pressure plate 24, the upper mounting block 27 is moved downward, and the pipe fitting 26 is fixed by the upper mounting block 27 and the lower mounting block 25.

[0043] Opposite to the mounting base 10 is a mounting plate 2 fixedly connected to the base plate 1. A first motor 3 is mounted on the mounting plate 2. The output end of the first motor 3 is mounted on a first rotating column 31 rotatably connected to the mounting plate 2. A driving pulley 30 and a cutting wheel 29 are fixedly mounted on the first rotating column 31. The driving pulley 30 is connected to a driven pulley 33. The driven pulley 33 is fixedly connected to a second rotating column 34 rotatably connected to the mounting plate 2. A grinding wheel 28 corresponding to the cutting wheel 29 is mounted on the second rotating column 34.

[0044] like Figure 1 and 8 As shown in Figure 9, the mounting plate 2 serves to mount the first motor 3. When the first motor 3 is working, the output end of the first motor 3 drives the first rotating column 31 to rotate. The first rotating column 31 drives the driving pulley 30 and the cutting wheel 29 to rotate. A transmission belt 32 is provided between the driving pulley 30 and the driven pulley 33. The transmission belt 32 drives the driven pulley 33 to rotate, and the driven pulley 33 drives the grinding wheel 28 to rotate.

[0045] The upper end of the V-groove 11 is at the same height as the upper end of the parallel section of the U-groove 12.

[0046] like Figure 2 As shown, the upper end of the V-groove 11 is at the same height as the upper end of the U-groove 12, ensuring that when the top of the V-groove 11 moves to the top of the vertical groove section of the U-groove 12, it will drive the pin block 13 at one end of the pin rod 14 to move horizontally along the horizontal groove section of the U-groove 12.

[0047] A method for using a cutting and grinding device for stainless steel pipe fittings includes the following steps:

[0048] Step 1: Based on the diameter of the stainless steel pipe fitting 26, use the upper mounting block 27 and the lower mounting block 25 to fix the stainless steel pipe fitting 26 onto the fixing plate 16.

[0049] Step 2: Control the cutting wheel 29 and the grinding wheel 28 to work synchronously;

[0050] Step 3: Under the action of the V-shaped groove 11 on the slide plate 8 and the U-shaped groove 12 on the mounting base 10, the fixing plate 16 drives the stainless steel pipe 26 to move from bottom to top, and the cutting wheel 29 cuts the pipe 26.

[0051] Step 4: After cutting the pipe 26 with the cutting wheel 29, the pipe 26 moves to the top of the V-groove 11 and moves horizontally parallel to the upper end of the U-groove 12. The grinding wheel 28 is used to grind the pipe 26 in the horizontal direction. When the pipe 26 moves to one end of the U-groove 12, it continues to move downward and the grinding wheel 28 is used to grind the pipe 26 in the vertical direction.

[0052] The working process of this invention is as follows: When in use, the stainless steel pipe fitting 26 is fixedly installed on the lower mounting block 25 on the fixing plate 16 according to the diameter of the stainless steel pipe fitting 26. The screw rod 20 is driven to rotate by the rotating handle 18. During the rotation, the screw rod 20 is threadedly engaged with the screw cylinder 21 in the first slider 19 and the second slider 22, thereby realizing the opposite movement of the first slider 19 and the second slider 22. When the first slider 19 and the second slider 22 move towards the center, they drive the pressure rod 23 to press down. The pressure rod 23 drives the pressure plate 24 to move downward. During the downward movement of the pressure plate 24, the upper mounting block 27 moves down. The upper mounting block 27 and the lower mounting block 25 are used to fix the pipe fitting 26.

[0053] When the first motor 3 is working, the output end of the first motor 3 drives the first rotating column 31 to rotate. The first rotating column 31 drives the driving pulley 30 and the cutting wheel 29 to rotate. A transmission belt 32 is provided between the driving pulley 30 and the driven pulley 33. The transmission belt 32 drives the driven pulley 33 to rotate. The driven pulley 33 drives the grinding wheel 28 to rotate. The cutting wheel 29 and the grinding wheel 28 work synchronously.

[0054] The second motor 5 operates, driving the rotating rod 6 to rotate. The rotating rod 6 then drives the support rod 7 to rotate. During the deflection of the support rod 7, the sliding plate 8, under the action of the sliding pin 9, can slide along the inner wall of the mounting base 10. During the sliding process, the V-groove 11 drives the pin block 13 at one end of the pin rod 14 to move upward along the vertical section of the U-groove 12. When the top of the V-groove 11 reaches the top of the vertical section of the U-groove 12, it drives the pin block 13 at one end of the pin rod 14 to move horizontally along the horizontal section of the U-groove 12. When the pin rod 14 moves to the vertical section at the other end of the U-groove 12, the pin block 13 moves vertically downward, thus realizing the vertical upward movement, horizontal movement, and vertical downward movement of the fixing plate 16 on the mounting plate 15. The movement trajectory involves cutting the pipe 26 using the cutting wheel 29, followed by horizontal movement of the pipe 26 parallel to the middle of the U-shaped trajectory. The grinding wheel 28 then grinds the pipe 26 horizontally. When the pipe 26 reaches one end of the U-shaped trajectory, it continues to move downwards, grinding the pipe 26 vertically using the grinding wheel 28. Horizontal grinding primarily targets the circumferential or axial surfaces of the pipe 26, eliminating longitudinal scratches and protrusions. The up-and-down movement covers areas missed by horizontal grinding, especially dead corners such as the curvature changes and interface bends of the pipe 26. The superposition of these two movements ensures more comprehensive contact between the abrasive and the surface of the pipe 26, avoiding the problems of stripes or localized over-grinding caused by grinding in one direction, resulting in a more uniform surface roughness.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cutting and grinding device for stainless steel pipe fittings, comprising a base plate (1), wherein a mounting base (10) is fixedly disposed on the upper end of the base plate (1), characterized in that: The mounting base (10) is provided with a driving structure, which includes a fixed plate (16) for mounting the pipe fitting (26) and capable of U-shaped movement. The pipe fitting (26) on the fixed plate (16) can be vertically cut and then ground in multiple directions under the limitation of the U-shaped movement trajectory. The fixed plate (16) is provided with an adjustment structure that can be fixed according to different pipe fitting (26) diameters. Opposite the mounting base (10) is a mounting plate (2) fixedly mounted to the base plate (1). The mounting plate (2) is provided with a cutting wheel (29) and a grinding wheel (28) that can be driven synchronously. A sliding plate is slidably connected to the mounting base (10). (8) The two ends of the slide plate (8) are respectively provided with sliding pins (9) that limit the sliding of the inner wall of the mounting base (10). One end of the support rod (7) is rotatably connected to one end of the slide plate (8). The slide plate (8) is provided with a V-shaped groove (11). The mounting base (10) is provided with a U-shaped groove (12) that cooperates with the V-shaped groove (11). The inner wall of the U-shaped groove (12) is slidably connected with a pin block (13). One end of the pin block (13) is installed with a pin rod (14) that is slidably disposed in the V-shaped groove (11). One end of the pin rod (14) is fixedly connected with a mounting plate (15). The mounting plate (16) is fixedly connected to the mounting plate (15).

2. The cutting and grinding device for stainless steel pipe fittings according to claim 1, characterized in that: The drive structure also includes a support plate (4) fixedly mounted on the base plate (1). A second motor (5) is installed on the upper end of the support plate (4). A rotating rod (6) is fixedly connected to the output end of the second motor (5). A support rod (7) is rotatably connected to one end of the rotating rod (6).

3. The cutting and grinding device for stainless steel pipe fittings according to claim 1, characterized in that: The adjustment structure includes a fixed plate (16), with a first side plate (17) and a second side plate (35) fixedly connected to both ends of the fixed plate (16). A lead screw (20) is rotatably connected to the first side plate (17) and the second side plate (35). A first slider (19) and a second slider (22) are respectively provided at both ends of the lead screw (20). A screw cylinder (21) that is threaded to the lead screw (20) is fixedly connected to the inner wall of the first slider (19) and the second slider (22). A pressure rod (23) is rotatably connected to both ends of the first slider (19) and the second slider (22). The lower end of the pressure rod (23) is rotatably mounted on a pressure plate (24) that is slidably connected to the opposite surface of the first side plate (17) and the second side plate (35).

4. The cutting and grinding device for stainless steel pipe fittings according to claim 3, characterized in that: The upper end of the fixing plate (16) is equipped with a lower mounting block (25), and the lower end of the pressure plate (24) is equipped with an upper mounting block (27) corresponding to the lower mounting block (25).

5. The cutting and grinding device for stainless steel pipe fittings according to claim 1, characterized in that: The mounting base (10) is provided with a mounting plate (2) fixedly connected to the base plate (1) on the opposite side. A first motor (3) is mounted on the mounting plate (2). A first rotating column (31) rotatably connected to the mounting plate (2) is mounted on the output end of the first motor (3). A driving pulley (30) and a cutting wheel (29) are fixedly mounted on the first rotating column (31). A driven pulley (33) is connected to the driving pulley (30). A second rotating column (34) rotatably connected to the mounting plate (2) is fixedly connected to the driven pulley (33). A grinding wheel (28) corresponding to the cutting wheel (29) is mounted on the second rotating column (34).

6. The cutting and grinding device for stainless steel pipe fittings according to claim 1, characterized in that: The upper end of the V-groove (11) is at the same height as the upper end of the parallel section of the U-groove (12).

7. The method of using the cutting and grinding device for stainless steel pipe fittings according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Control and adjust the operation of the structure. According to the diameter of the stainless steel pipe fitting (26), use the upper mounting block (27) and the lower mounting block (25) to fix the stainless steel pipe fitting (26) on the fixing plate (16); Step 2: Control the cutting wheel (29) and the grinding wheel (28) to work synchronously; Step 3: Control the drive structure to work. Under the action of the V-groove (11) on the slide plate (8) and the U-groove (12) on the mounting base (10), the fixed plate (16) drives the stainless steel pipe (26) to move from bottom to top, and uses the cutting wheel (29) to cut the pipe (26); Step 4: After cutting the pipe (26) with the cutting wheel (29), the pipe (26) moves to the top of the V-groove (11) and moves horizontally parallel to the upper end of the U-groove (12). The pipe (26) is then ground horizontally with the grinding wheel (28). When the pipe (26) moves to one end of the U-groove (12), it continues to move downwards. The pipe (26) is then ground vertically with the grinding wheel (28).

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