A notched device and method for stainless steel pipe production

Abstract

The present application relates to the technical field of stainless steel pipe processing, in particular to a groove planing device and method for stainless steel pipe production, comprising a rack, a workbench and a groove planing mechanism, wherein the workbench is slidingly arranged on the rack, and a plurality of positioning grooves are formed on the workbench along the length direction of the workbench; the groove planing mechanism is arranged on the top of the rack through a two-axis moving mechanism; a pressing mechanism is arranged on the workbench, and the pressing mechanism is used for pressing the steel pipe to be processed placed on the workbench from top to bottom. In the present application, the steel pipe limiting mechanism can clamp the steel pipe from outside to inside, and can also tighten the steel pipe from inside to outside, so that different clamping modes are selected under different groove planing operation conditions to offset the downward pressure on the steel pipe during groove planing operation.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe processing technology, specifically to a grooving device and method for stainless steel pipe production. Background Technology

[0002] Currently, stainless steel pipes have a wide range of applications in industrial manufacturing and engineering. Under certain working conditions, it is necessary to perform grooving along the axial direction of the steel pipe on its outer or inner surface. For example, to achieve a sealing fit at pipe connections, prepare weld bevels, or assemble and position specific structural components, it is often necessary to create grooves on the outer or inner surface of the steel pipe.

[0003] For thin-walled steel pipes, this type of grooving operation requires relatively high stability in clamping and high machining accuracy. Therefore, reliable positioning and fixing of the steel pipe are necessary before machining. In grooving stainless steel pipes, a clamping mechanism is needed to hold the end of the steel pipe to be grooved to suppress displacement and vibration during machining. Existing devices typically have a limiting mechanism and a clamping mechanism on the worktable. The clamping body and limiting structure constrain the steel pipe from the outside, keeping it relatively stationary during tool feed, thus providing basic positioning conditions for grooving.

[0004] However, for thin-walled steel pipes, during the grooving process, the cutting tool exerts downward pressure on the pipe wall, and the clamping mechanism also applies pressure, causing the pipe wall to deform. When the grooving area is located on the top surface of the outer wall of the steel pipe, the clamping force from the outside in can partially offset the radial concave deformation caused by the downward pressure of the cutting tool; however, when the grooving area is located on the bottom surface of the inner wall of the steel pipe, the downward pressure of the cutting tool acts on the inner bottom side, and the clamping force from the outside in tends to be in the same direction as this downward pressure, which may further aggravate the radial convex deformation tendency of the pipe wall, thus affecting the processing accuracy. To address these shortcomings, this invention proposes a grooving device and method for stainless steel pipe production. Summary of the Invention

[0005] The purpose of this invention is to provide a grooving device and method for stainless steel pipe production, which solves the problems mentioned in the background art.

[0006] This invention is achieved through the following technical solution: a grooving device for stainless steel pipe production, comprising: frame; A worktable is slidably mounted on a frame, and multiple positioning grooves are formed on the worktable along its length. A grooving mechanism, wherein the grooving mechanism is mounted on the top of the frame via a two-axis moving mechanism; The workbench is equipped with a clamping mechanism, which is used to apply pressure to the steel pipe to be processed placed on the workbench from top to bottom; The grooving mechanism includes a tool holder, a tool base, and a cutting tool. The tool holder extends along the length of the worktable. One end of the tool holder is connected to the movable end of the two-axis moving mechanism. The tool base is fixedly installed at the other end of the tool holder, and the cutting tool is installed at the bottom of the tool base. A steel pipe limiting mechanism is provided on the workbench and at the front end of one of the positioning slots. The steel pipe limiting mechanism includes two retaining blocks that are distributed opposite to each other along the width direction of the workbench. Each retaining block is slidably engaged with the workbench along the width direction of the workbench. On the side of the retaining block facing the positioning slot, there are two outer clamping bodies and inner clamping bodies that are distributed opposite to each other along the width direction of the workbench. The outer clamping bodies and inner clamping bodies are respectively used to abut against the outer surface and inner surface of the steel pipe. The worktable is also equipped with a clamping transmission mechanism, which is connected to the tool holder and the two retaining blocks to drive the two retaining blocks to move relative to each other when the tool holder moves vertically up and down; when the tool holder rises, the clamping transmission mechanism can drive the two retaining blocks to move closer to each other; when the tool holder falls, the clamping transmission mechanism can drive the two retaining blocks to separate from each other.

[0007] To enable the clamping transmission mechanism to accurately drive the two retaining blocks to move closer or further apart, the clamping transmission mechanism includes two driving bodies, each connected to one of the two retaining blocks. A driving groove is formed on the upper surface of the worktable, below the steel pipe limiting mechanism. Both driving bodies are slidably connected within the driving groove along the width of the worktable. The clamping transmission mechanism includes a bidirectional screw, a driven gear ring, a driving rack, and a sliding part. The bidirectional screw is rotatably connected within the driving groove and threadedly connected to the driving body. The driven gear ring is fixedly fitted onto the outside of the bidirectional screw. The driving rack is slidably connected vertically within the driving groove and meshes with the driven gear ring. The sliding part is fixedly located at the top of the driving rack and slidably engages with the tool holder. The inner wall of the driving groove has a slide rail extending along the width of the worktable, and the driving body slidably engages with the slide rail.

[0008] To avoid rigid contact between the outer clamping body, the inner clamping body, and the steel pipe to be processed, the bottom surface of the retaining block is provided with a movable groove for the driving body to be embedded. The top two ends of the driving body are elastically connected to the inner wall of the movable groove through elastic elements.

[0009] The present invention also proposes a grooving method for stainless steel pipe production, using the grooving device for stainless steel pipe production as described above, comprising the following steps: First, place the steel pipe that needs to be grooved on the workbench and align it with the positioning groove of the steel pipe limiting mechanism, and then insert the end of the steel pipe between the outer clamping body and the inner clamping body. The clamping mechanism is activated to clamp and fix the steel pipe to be processed. When it is necessary to plan a groove on the top of the outer surface of the steel pipe, start the tool to rise and align it with the upper surface of the outer wall of the steel pipe. At this time, the two holding blocks are close to each other, and the two outer clamping bodies clamp the outer sides of the steel pipe respectively. Then drive the worktable to move relative to the tool along the axial direction of the steel pipe to complete the grooving operation. When it is necessary to groove the bottom of the inner surface of the steel pipe, start the cutter to descend and align it with the lower inner surface of the steel pipe. At this time, the two holding blocks separate from each other, and the two inner clamping bodies abut against the two sides of the inner surface of the steel pipe respectively. Then drive the worktable to move relative to the cutter along the axial direction of the steel pipe to complete the grooving operation.

[0010] Compared with the prior art, the present invention provides a grooving device and method for stainless steel pipe production, which has the following beneficial effects: 1. In this invention, the steel pipe limiting mechanism can clamp the steel pipe from the outside to the inside and also tighten the steel pipe from the inside to the outside, so that different clamping methods can be selected under different grooving operation conditions to counteract the downward pressure on the steel pipe during grooving operation. 2. In this invention, the steel pipe limiting mechanism and the grooving mechanism are linked by a clamping transmission mechanism. When the cutter is aligned with the top wall of the steel pipe, the limiting mechanism automatically clamps the steel pipe from the outside to the inside. When the cutter is aligned with the bottom wall of the steel pipe, the limiting mechanism automatically tightens the steel pipe from the inside to the outside. No manual adjustment or program control is required. The mechanical linkage control structure is simpler and more reliable. 3. The present invention also includes a clamping mechanism, which can simultaneously clamp and fix multiple steel pipes to maintain the stability and processing accuracy of the grooving process. Attached Figure Description

[0011] Figure 1 A schematic diagram of the stress state of the grooved inner wall of an existing steel pipe; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a front view of the structure of the present invention; Figure 4 This is a cross-sectional view of the workbench structure of the present invention; Figure 5 This is a schematic diagram of the workbench structure of the present invention; Figure 6 This is a schematic diagram of the clamping transmission mechanism of the present invention; Figure 7 This is a schematic diagram showing the disassembled structure of the steel pipe limiting mechanism and the driving body of the present invention.

[0012] In the diagram: 100, frame; 101, first linear module; 200, worktable; 201, positioning slot; 202, drive slot; 300, grooving mechanism; 301, tool holder; 302, tool support; 303, cutting tool; 400, two-axis moving mechanism; 401, second linear module; 402, third linear module; 500, clamping mechanism; 501, vertical plate; 502, clamping body; 503, slide cylinder; 600, steel pipe limiting mechanism; 601, retaining block; 602, outer clamping body; 603, inner clamping body; 604, protruding rib; 700, clamping transmission mechanism; 701, drive body; 702, elastic element; 703, bidirectional screw; 704, driven gear ring; 705, driving rack; 706, sliding part. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Currently, when fulfilling the requirements of steel pipe assembly positioning, limiting, clamping, and guiding, it is often necessary to open a groove distributed along the axial direction of the steel pipe on the outer or inner wall of the end of the steel pipe. Its function is to prevent the parts from moving around in the circumference or to play a positioning and guiding role.

[0015] Please see Figure 1 This diagram illustrates the stress state of a grooved inner wall of a steel pipe. When the cutting tool grooves the inner wall of the steel pipe, it inevitably exerts a certain downward pressure on the inner wall, while the clamping mechanisms on both sides of the outside also exert inward compressive force on the sidewalls of the steel pipe. Under the combined action of these three forces, the bottom wall of the steel pipe tends to bulge downwards. In particular, thin-walled steel pipes have relatively low resistance to deformation, and the aforementioned forces may cause deformation at the ends of the steel pipe.

[0016] To address the above problems, the present invention proposes the following technical solution: Example 1: Please refer to Figures 2 to 7This application proposes a grooving device for stainless steel pipe production, including a frame 100, a worktable 200, and a grooving mechanism 300. The worktable 200 is slidably mounted on the frame 100. Multiple positioning grooves 201 are formed on the worktable 200 along its length. One end of each positioning groove 201 originates from the end face of the worktable 200, and the other end of each positioning groove 201 is spaced a certain distance from the other end face of the worktable 200. The cross-section of each positioning groove 201 is V-shaped, serving to limit the movement of the steel pipe. The frame 100 is equipped with a first linear module 101 for driving the worktable 200 to slide along its length. The first linear module 101 can be a slide cylinder, used to directly drive the worktable 200 to translate.

[0017] The grooving mechanism 300 is mounted on the top of the frame 100 via a two-axis moving mechanism 400. The two-axis moving mechanism 400 includes a second linear module 401 extending along the width direction of the worktable 200 and a third linear module 402 extending along the vertical direction. The grooving mechanism 300 includes a tool holder 301, a tool support 302, and a cutting tool 303. The tool holder 301 extends along the length direction of the worktable 200. One end of the tool holder 301 is connected to the movable end of the two-axis moving mechanism 400. The tool support 302 is fixedly mounted on the other end of the tool holder 301, and the cutting tool 303 is mounted on the bottom of the tool support 302. The two-axis moving mechanism 400 is fixedly installed on the frame 100, and its movable end is connected to the tool holder 301 to control the movement of the cutting tool 303 in a two-dimensional plane in the vertical direction to adapt to the grooving requirements of steel pipes of different diameters and positions.

[0018] like Figure 4 As shown, a clamping mechanism 500 is provided on the workbench 200. The clamping mechanism 500 is used to apply pressure from top to bottom to the steel pipe to be processed placed on the workbench 200. The clamping mechanism 500 includes vertical plates 501 fixed to the left and right ends of the workbench 200 and a clamping body 502 located between the two vertical plates 501. Each of the two vertical plates 501 has a sliding cylinder 503 on its facing surface. The movable end of the sliding cylinder 503 is fixedly connected to the end of the clamping body 502. The lower surface of the clamping body 502 is parallel to the upper surface of the workbench 200. Since the sliding cylinders 503 are distributed in the vertical direction, the sliding cylinders 503 can directly control the up and down translation of the clamping body 502 to clamp and fix the steel pipe to be processed. It is worth mentioning that the lower surface of the clamping body 502 also has several V-shaped grooves, and the V-shaped grooves on the lower surface of the clamping body 502 and the positioning grooves 201 on the upper surface of the worktable 200 are distributed opposite each other. The purpose is to improve the stability of the clamping, which is conducive to maintaining the stability of the steel pipe and improving the processing accuracy.

[0019] In some embodiments of this application, a steel pipe limiting mechanism 600 is provided on the workbench 200 and at the front end of one of the positioning grooves 201. The steel pipe limiting mechanism 600 includes two retaining blocks 601 that are relatively distributed along the width direction of the workbench 200. Each retaining block 601 is slidably engaged with the workbench 200 along the width direction of the workbench 200. On the side of the retaining block 601 facing the positioning groove 201, there are two outer clamping bodies 602 and inner clamping bodies 603 that are relatively distributed along the width direction of the workbench 200. The outer clamping bodies 602 and inner clamping bodies 603 are respectively used to abut against the outer surface and the inner surface of the steel pipe. The side of the outer clamping body 602 opposite to the inner clamping body 603 is provided with a V-shaped groove, which extends along the length direction of the workbench 200. The inner clamping body 603 has two protruding ribs 604 on one side opposite the outer clamping body 602. The two protruding ribs 604 are symmetrically distributed vertically and extend along the length of the worktable 200. The gap between the outer clamping body 602 and the inner clamping body 603 is used for the side wall of the steel pipe to be processed to be embedded. The V-shaped groove on the surface of the outer clamping body 602 can adapt to the outer circumferential contour of the steel pipe, playing a good clamping and limiting role. The two protruding ribs 604 on the surface of the inner clamping body 603 can also simultaneously abut against the inner surface of the steel pipe, thereby achieving the effect of uniform force application.

[0020] It is worth mentioning that in this embodiment, the centers of both the outer clamping body 602 and the inner clamping body 603 are aligned with the center of the steel pipe to be processed. Therefore, this embodiment can only process steel pipes of a single diameter. If a different specification of steel pipe is required, the position of the retaining block 601 needs to be adjusted. Furthermore, to avoid rigid contact between the outer clamping body 602 and the inner clamping body 603 and the steel pipe, a rubber layer is applied to the V-groove surface of the outer clamping body 602 and the surface of the protruding rib 604 of the inner clamping body 603 to prevent indentations from being left on the steel pipe surface.

[0021] In some embodiments of this application, the worktable 200 is further provided with a clamping transmission mechanism 700, which is connected to the tool holder 301 and two retaining blocks 601. This mechanism drives the two retaining blocks 601 to move relative to each other when the tool holder 301 moves vertically up and down. When the tool holder 301 rises, the clamping transmission mechanism 700 drives the two retaining blocks 601 to move closer together; when the tool holder 301 falls, the clamping transmission mechanism 700 drives the two retaining blocks 601 to separate. In other words, the clamping transmission mechanism 700 links the movements of the tool holder 301 and the retaining blocks 601 together, allowing the tool 303 to selectively use the outer clamping body 602 or the inner clamping body 603 to fix the steel pipe when machining its outer or inner surface.

[0022] Further explanation is needed here. When grooving the top surface of the outer wall of the steel pipe, the cutting tool 303 applies a certain radial downward cutting pressure to the steel pipe during the cutting process. For steel pipes with thin walls, due to their limited bending stiffness, this downward pressure will inevitably cause a certain degree of radial inward deformation of the pipe wall. To effectively suppress and counteract this type of processing deformation, the present invention preferably uses two outer clamping bodies 602 to apply clamping force from both sides of the steel pipe, forming a symmetrical clamping structure from the outside to the inside. The radial support force generated by this clamping method can effectively counteract the inward tendency of the pipe wall induced by the downward pressure of the cutting tool, thereby ensuring the geometric accuracy and structural stability of the steel pipe during processing.

[0023] Conversely, when the grooving operation is switched to the bottom surface of the inner wall of the steel pipe, the tool 303 also applies radially downward cutting pressure to the steel pipe. However, at this time, the position of this downward pressure is located on the bottom inside the steel pipe, and its direction of action will cause the pipe wall to deform radially outward. Under this condition, if the clamping method of the outer clamping body 602 applying pressure from both sides to the inside is still used, the outer clamping force and the downward pressure of the tool will form a superimposed effect in the same direction. This will not only fail to suppress the deformation, but will also further aggravate the radial outward deformation of the steel pipe. In view of this, under this condition, the present invention should use the inner clamping body 603 to apply supporting force from the inside to the outside of the steel pipe, forming a radial support structure from the inside to the outside, so as to effectively counteract the outward deformation tendency of the pipe wall caused by the downward pressure of the tool and ensure machining accuracy and workpiece quality.

[0024] To enable the clamping transmission mechanism 700 to precisely control the displacement of the retaining block 601, in this embodiment, the clamping transmission mechanism 700 includes two driving bodies 701, each connected to one of the retaining blocks 601. A driving groove 202 is provided on the upper surface of the worktable 200, below the steel pipe limiting mechanism 600. Both driving bodies 701 are slidably connected within the driving groove 202 along the width direction of the worktable 200. The inner wall of the driving groove 202 is provided with a slide rail extending along the width direction of the worktable 200, and the driving bodies 701 are slidably engaged with the slide rail. The two driving bodies 701 are slidably connected in the driving groove 202, and they can move closer or further apart along the width direction of the worktable 200. Specifically, the bottom surface of the retaining block 601 has a movable groove for the driving body 701 to be inserted into, and the top ends of the driving body 701 are elastically connected to the inner wall of the movable groove via elastic members 702. The elastic element 702 is a spring, and the spring axis is also consistent with the width direction of the worktable 200. Therefore, when the two driving bodies 701 approach each other, they will first drive the two outer clamping bodies 602 to simultaneously abut against the outer wall of the steel pipe. Then, as the driving bodies 701 continue to approach, they will compress the spring and increase the clamping force of the outer clamping bodies 602 against the outer wall of the steel pipe, thereby holding the front end of the steel pipe tightly and preventing it from shaking, thus improving the grooving accuracy.

[0025] As one embodiment and not a limitation, the clamping transmission mechanism 700 includes a bidirectional screw 703, a driven gear ring 704, a driving rack 705, and a sliding part 706. The bidirectional screw 703 is rotatably connected to the drive groove 202 and threadedly connected to the drive body 701. The driven gear ring 704 is fixedly fitted onto the outside of the bidirectional screw 703. The driving rack 705 is slidably connected vertically to the drive groove 202 and meshes with the driven gear ring 704. The sliding part 706 is fixedly disposed at the top end of the driving rack 705 and slides in cooperation with the tool holder 301. Specifically, the drive groove 202 has shaft holes at both opposite ends, and both ends of the bidirectional screw 703 are rotatably connected to the shaft holes through bearings. The driven gear ring 704 is fixedly fitted onto the outer end of the bidirectional screw 703, and the bottom of the driving rack 705 penetrates the worktable 200. It should be noted that the bottom end of the drive groove 202 has a through hole through which the drive rack 705 passes, meshing with the driven gear ring 704. The sliding part 706 slides with the tool holder 301 along the length of the worktable 200. That is, as the tool 303 grooves along the axial direction of the steel pipe, the sliding part 706 can slide relative to the tool holder 301, but it will not drive the drive rack 705. When the tool 303 is raised or lowered to adjust its alignment with the top or bottom wall of the steel pipe, the two retaining blocks 601 will move closer or further apart under the action of the drive rack 705.

[0026] It should be noted that in this embodiment, the steel pipe limiting mechanism 600 is only for the end grooving of thin-walled steel pipes. When the pipe wall is thick and not easily deformed by clamping and grooving, the steel pipe limiting mechanism 600 and the clamping transmission mechanism 700 can be completely removed, and multiple steel pipes can be arranged on several positioning grooves 201 at the same time to achieve one-time processing of multiple steel pipes.

[0027] This application uses a clamping transmission mechanism 700 to link the tool holder 301 with the steel pipe limiting mechanism 600. When the tool 303 is aligned with the top surface of the outer wall of the steel pipe, the holding block 601 drives the two outer clamping bodies 602 to clamp the steel pipe from both sides inward, thus counteracting the radial inward deformation of the pipe wall induced by the downward pressure of the tool 303. When the tool 303 is aligned with the bottom surface of the inner wall of the steel pipe, the holding block 601 drives the two inner clamping bodies 603 to support the steel pipe from the inside out, thus counteracting the radial outward deformation of the pipe wall caused by the downward pressure of the tool 303. This linkage design can automatically switch the clamping direction according to the processing location, ensuring that the clamping force direction is always opposite to the downward pressure direction of the tool, thereby effectively suppressing the deformation of the thin-walled steel pipe wall during the grooving process and improving processing accuracy and workpiece quality. Furthermore, the linkage design between the tool holder 301 and the steel pipe limiting mechanism 600 allows the clamping mode to automatically switch when the tool 303 rises and falls, eliminating the need for an additional drive source or separate control, simplifying the operation process and improving processing efficiency.

[0028] Example 2: Please refer to Figures 2 to 7 This application also proposes a grooving method for stainless steel pipe production, using the grooving device for stainless steel pipe production as described in Embodiment 1, including the following steps: First, place the steel pipe that needs to be grooved on the workbench 200 and align it with a positioning groove 201 of the steel pipe limiting mechanism 600, and let the end of the steel pipe be embedded between the outer clamping body 602 and the inner clamping body 603. Start the clamping mechanism 500 to clamp and fix the steel pipe to be processed; When it is necessary to groove the top of the outer surface of the steel pipe, the cutter 303 is raised and aligned with the upper surface of the outer wall of the steel pipe. At this time, the two retaining blocks 601 approach each other, and the two outer clamping bodies 602 clamp the outer sides of the steel pipe respectively. Then, the worktable 200 is driven to move axially relative to the cutter 303 to complete the grooving operation. It should be noted that in the initial state, the cutter 303 is aligned with the center position of the steel pipe, so the left and right side walls of the steel pipe can be simultaneously embedded in the gaps between the two outer clamping bodies 602 and the inner clamping body 603. When it is necessary to groove the top wall of the outer surface of the steel pipe, the cutter 303 is driven to rise through the two-axis moving mechanism 400, which in turn drives the bidirectional screw 703 to rotate through the active rack 705 and the driven gear ring 704, thereby controlling the two retaining blocks 601 to approach each other. When the cutter 303 is aligned with the top wall of the steel pipe, the two outer clamping bodies 602 are in close contact with the outer wall of the steel pipe, thereby maintaining the stability of the front end of the steel pipe and avoiding shaking that affects the processing accuracy.

[0029] When it is necessary to groove the bottom of the inner surface of the steel pipe, the cutter 303 is lowered and aligned with the lower inner surface of the steel pipe. At this time, the two retaining blocks 601 separate from each other, and the two inner clamping bodies 603 respectively abut against the two sides of the inner surface of the steel pipe. Then, the worktable 200 is driven to move axially relative to the cutter 303 to complete the grooving operation. It should be noted that when it is necessary to groove the bottom wall of the steel pipe, the cutter 303 needs to be driven to move down again. At this time, under the drive of the clamping transmission assembly 700, the two retaining blocks 601 move away from each other. When the cutter 303 is aligned with the bottom wall of the steel pipe, both inner clamping bodies 603 are in close contact with the inner surface of the steel pipe.

[0030] Finally, it is worth mentioning that during the actual grooving process, the tool 303 will advance along the axial direction of the steel pipe. At this time, the sliding part 706 and the tool holder 301 slide relative to each other and will not drive the active rack 705 to move. That is, the steel pipe limiting mechanism 600 can always clamp the steel pipe.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can 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 grooving device for stainless steel pipe production, comprising: frame; A worktable is slidably mounted on a frame, and multiple positioning grooves are formed on the worktable along its length. A grooving mechanism, wherein the grooving mechanism is mounted on the top of the frame via a two-axis moving mechanism; Its features are: The workbench is equipped with a clamping mechanism, which is used to apply pressure to the steel pipe to be processed placed on the workbench from top to bottom; The grooving mechanism includes a tool holder, a tool base, and a cutting tool. The tool holder extends along the length of the worktable. One end of the tool holder is connected to the movable end of the two-axis moving mechanism. The tool base is fixedly installed at the other end of the tool holder, and the cutting tool is installed at the bottom of the tool base. A steel pipe limiting mechanism is provided on the workbench and at the front end of one of the positioning slots. The steel pipe limiting mechanism includes two retaining blocks that are distributed opposite to each other along the width direction of the workbench. Each retaining block is slidably engaged with the workbench along the width direction of the workbench. On the side of the retaining block facing the positioning slot, there are two outer clamping bodies and inner clamping bodies that are distributed opposite to each other along the width direction of the workbench. The outer clamping bodies and inner clamping bodies are respectively used to abut against the outer surface and inner surface of the steel pipe. The worktable is also equipped with a clamping transmission mechanism, which is connected to the tool holder and the two retaining blocks to drive the two retaining blocks to move relative to each other when the tool holder moves vertically up and down; when the tool holder rises, the clamping transmission mechanism can drive the two retaining blocks to move closer to each other; when the tool holder falls, the clamping transmission mechanism can drive the two retaining blocks to separate from each other.

2. The grooving device for stainless steel pipe production according to claim 1, characterized in that: The clamping mechanism includes vertical plates fixed to the left and right ends of the workbench and a clamping body located between the two vertical plates. Each of the two vertical plates is provided with a sliding cylinder on its facing surface. The movable end of the sliding cylinder is fixedly connected to the end of the clamping body. The lower surface of the clamping body is parallel to the upper surface of the workbench.

3. The grooving device for stainless steel pipe production according to claim 1, characterized in that: The outer clamping body has a V-shaped groove on one side relative to the inner clamping body, and the V-shaped groove extends along the length of the worktable.

4. The grooving device for stainless steel pipe production according to claim 1, characterized in that: The inner clamping body has two protruding ribs on one side relative to the outer clamping body. The two protruding ribs are symmetrically distributed vertically and extend along the length of the worktable.

5. A grooving device for stainless steel pipe production according to claim 1, characterized in that: The clamping transmission mechanism includes two driving bodies, which are respectively connected to two retaining blocks; a driving groove is provided on the upper surface of the worktable and below the steel pipe limiting mechanism, and both driving bodies are slidably connected in the driving groove along the width direction of the worktable.

6. A grooving device for stainless steel pipe production according to claim 5, characterized in that: The clamping transmission mechanism includes a bidirectional screw, a driven gear ring, a driving rack, and a sliding part. The bidirectional screw is rotatably connected in the drive groove and threadedly connected to the drive body. The driven gear ring is fixedly fitted onto the outside of the bidirectional screw. The driving rack is slidably connected vertically in the drive groove and meshes with the driven gear ring. The sliding part is fixedly disposed at the top of the driving rack and slides in cooperation with the tool holder.

7. A grooving device for stainless steel pipe production according to claim 6, characterized in that: The inner wall of the drive groove is provided with a slide rail extending along the width direction of the worktable, and the drive body slides in cooperation with the slide rail.

8. A grooving device for stainless steel pipe production according to claim 5, characterized in that: The bottom surface of the retaining block is provided with a movable groove for the drive body to be embedded, and the top two ends of the drive body are elastically connected to the inner wall of the movable groove through elastic elements.

9. A grooving device for stainless steel pipe production according to claim 1, characterized in that: The frame is provided with a first linear module for driving the worktable to slide along its own length direction, and the two-axis moving mechanism includes a second linear module extending along the width direction of the worktable and a third linear module extending along the vertical direction.

10. A grooving method for producing stainless steel pipes, characterized in that, Using the grooving apparatus for stainless steel pipe production as described in any one of claims 1-9 includes the following steps: First, place the steel pipe that needs to be grooved on the workbench and align it with the positioning groove of the steel pipe limiting mechanism, and then insert the end of the steel pipe between the outer clamping body and the inner clamping body. The clamping mechanism is activated to clamp and fix the steel pipe to be processed. When it is necessary to plan a groove on the top of the outer surface of the steel pipe, start the tool to rise and align it with the upper surface of the outer wall of the steel pipe. At this time, the two holding blocks are close to each other, and the two outer clamping bodies clamp the outer sides of the steel pipe respectively. Then drive the worktable to move relative to the tool along the axial direction of the steel pipe to complete the grooving operation. When it is necessary to groove the bottom of the inner surface of the steel pipe, start the cutter to descend and align it with the lower inner surface of the steel pipe. At this time, the two holding blocks separate from each other, and the two inner clamping bodies abut against the two sides of the inner surface of the steel pipe respectively. Then drive the worktable to move relative to the cutter along the axial direction of the steel pipe to complete the grooving operation.

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