A square tube r angle forming device and method

Abstract

The present application relates to the field of processing of metal materials, and particularly relates to a square and rectangular tube R angle forming device and method, comprising a rack, a round tube is placed on the rack, and a guide assembly for guiding the deformation of the round tube is arranged on the rack corresponding to the conveying direction of the pipe; the present application preheats and heats the metal round tube through the guide assembly, and then drives the heated section of the pipe to slide through the rack; after being heated, the round tube is compressed and deformed between different rollers on the rack during the process of passing through the rack, and the round tube is gradually formed into the required square and rectangular tube shape; after the round tube is compressed into a square and rectangular shape, the guide assembly gradually separates from the surface of the initially formed square and rectangular tube, and abuts against the edges and corners of the square and rectangular tube, thereby achieving further local heating effect at the four corners of the initially formed square and rectangular tube, which is helpful for the R angle forming at the edges and corners of the square and rectangular tube, and reduces the required process equipment cost and operation difficulty while improving the forming quality of the square and rectangular tube.

Description

Technical Field

[0001] This invention relates to the field of metal material processing, and in particular to a square and rectangular tube R-angle forming device and method. Background Technology

[0002] The R-angle of a square or rectangular tube refers to the rounded transition part of the four corners of the tube. Generally speaking, the forming of square and rectangular tubes is mainly divided into two categories. The first category is round to square, that is, the steel plate is first formed into a round tube, and then a square tube is formed by precision rolling. The second category is direct square forming, that is, a square tube is formed by multiple bends, and then welded and precision rolled.

[0003] With the advancement of technology, technicians in related fields have optimized the technical means used for forming the radius (R) of rectangular tubes. For a more accurate comparison, Chinese Patent CN109226329B discloses a rectangular tube forming system and method, including a clamping unit, a forming unit, a welding unit, a finishing mill, and a leveling unit arranged sequentially. The forming unit is used to bend the strip into a convex rectangular tube with an arc shape, and after passing through the welding unit and the finishing mill, a high-quality rectangular tube is obtained. In use, by bending the strip in the initial forming stage and using the arc shape of the rollers to form the rectangular tube into a convex shape, it effectively prevents the inward instability phenomenon that occurs during the forming of large-size thin-walled tubes, facilitates the forming of the upper and lower R-angles, avoids thinning at the corner bending points, and improves the forming quality of the rectangular tube.

[0004] However, the following problems still exist when using the above-mentioned existing technology for processing and forming square and rectangular tubes: The existing technology described above requires the metal strip to be bent first when forming rectangular tubes. After the strip is guided into a convex rectangular tube by several different combinations of rollers, it is then sealed and welded by a welding unit. The strip then passes through a finishing mill and a leveling mill in sequence to finally form a rectangular tube with high dimensional accuracy. When forming rectangular tubes using the above technology, the entire process requires multiple units to be set up in sequence. The complexity of the equipment and the maintenance cost are high. The coordination and synchronization between the units also require precise control, which increases the difficulty of operation and management costs.

[0005] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing technologies for processing and forming square and rectangular tubes. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a rectangular tube R-angle forming device, comprising a frame, on which a round tube to be processed and a plurality of rollers corresponding to the round tube are placed. A guiding component for guiding the deformation of the round tube is arranged on the frame in the direction of tube conveying. The guiding component includes: The mounting frame has the corresponding pipes distributed on both sides of the frame along their axial direction.

[0007] The heating element is provided with multiple heating elements corresponding to the corners of the rectangular tube and distributed circumferentially inside the mounting frame, which can locally heat the corners of the rectangular tube during the forming process.

[0008] The adjusting end is connected to several heating parts and drives the heating parts to slide and adjust on the mounting frame so that the heating parts abut against the pipe and guide the pipe to heat up so that it can be rolled easily.

[0009] Preferably, the heating part includes a plurality of sliding seats that slide through the mounting frame. A roller is rotatably connected to one end of the sliding seat near the round tube. Two guide tubes that rotatably pass through the sliding seat are symmetrically connected to both ends of the roller. A heating rod located within the roller is connected between the two guide tubes. An induction wire is wound on the heating rod.

[0010] Preferably, the adjusting end includes an adjusting screw that is radially inserted into the mounting frame and connected to the sliding seat. One end of the adjusting screw that extends out of the mounting frame is fitted with a driven gear, and all the driven gears mesh with a drive gear ring that is rotationally limited on the mounting frame.

[0011] Preferably, a rotating sleeve is rotatably provided on the mounting frame corresponding to the adjusting screw, the rotating sleeve is threaded onto the adjusting screw, and the driven gear is fixedly sleeved on the rotating sleeve.

[0012] Preferably, the mounting frame is provided with an extension sleeve on the side near the frame. The extension sleeve is fixedly connected to the frame and rotatably connected to the mounting frame. A number of keyways are also evenly provided on the mounting frame in the circumferential direction. A drive gear that meshes with the number of keyways in the circumferential direction is connected to the frame corresponding to the mounting frame.

[0013] Preferably, the drive gear ring is fixedly connected to the extension sleeve via a bent connecting guide plate.

[0014] Preferably, the drive gear ring is connected to the connecting guide plate via a sliding block, and a limiting groove is formed on the connecting guide plate corresponding to the sliding block. A compression spring is connected between the sliding block and the limiting groove.

[0015] Preferably, the sliding block is configured in a "T" shape, and its horizontal section is slidably confined within the limiting groove.

[0016] Preferably, a drive shaft is provided between the two drive gears on both sides of the frame, and a mounting side plate connected to the frame is rotatably sleeved on the drive shaft.

[0017] In addition, the present invention also provides a method for forming the radius (R) of square and rectangular tubes, comprising the following steps: S1: Place the initial round tube to be processed on the frame, and use the frame and guide assembly to initially limit and hold the tube.

[0018] S2: After the pipe is installed, the heating part heats the surface of the contacting round pipe, and the adjusting end drives the heating part to rotate and slide along the surface of the round pipe to increase the uniformity of heating the round pipe so as to roll the round pipe into shape.

[0019] S3: During the process of forming a round tube into a rectangular tube, the heating part will gradually only contact the edges and corners of the deformed rectangular tube as the initial round tube is rolled and deformed, thereby reducing the yield strength of each edge and corner of the rectangular tube during the forming process and improving the quality and speed of the rectangular tube R-corner forming.

[0020] In summary, this application includes at least one of the following beneficial technical effects: I. This invention preheats a metal tube by using a guide component mounted on a frame. The heated section of the tube is then driven to slide through the frame. As the heated tube passes through the frame, it is compressed and deformed by the interaction of different rollers, gradually shaping it into the desired rectangular tube form. Once the tube is compressed into a rectangle, the guide component gradually detaches from the initially formed rectangular tube surface and abuts against the corners, achieving further localized heating at the four corners of the initially formed rectangular tube. This helps to form the radius (R) at the corners, improving the forming quality of the rectangular tube while reducing the cost of the required equipment and the difficulty of operation.

[0021] II. This invention uses a guiding component to heat the initial circular tube, and then, when the circular tube is initially rolled into a rectangular tube, forces the heating element to naturally detach from the tube surface. This causes the heat at the corners to gradually exceed that of the four tube surfaces, while the remaining tube surfaces also maintain a certain temperature. This avoids the problem of excessively rapid temperature loss at the corners during rolling, which could affect the forming quality, due to large temperature differences between the corners and adjacent tube surfaces. Furthermore, it reduces localized stress concentration issues that easily occur during tube deformation, thus improving both forming speed and quality. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the molded square and rectangular tube of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the guiding component of the present invention.

[0026] Figure 4 This is a schematic diagram of the heating element of the present invention.

[0027] Figure 5 This is the present invention. Figure 4 A magnified view of A in the middle.

[0028] Figure 6 This is a schematic diagram of the structure of the adjustment end of the present invention.

[0029] Figure 7 This is a schematic diagram of the connecting guide plate of the present invention.

[0030] Figure 8 This is the present invention. Figure 7 A magnified view of B in the middle.

[0031] Figure 9 This is a schematic diagram of the structure of the adjustable strut of the present invention.

[0032] In the diagram, 1 is the frame; 10 is the round tube; 100 is the rectangular tube; 2 is the guide assembly; 20 is the mounting frame; 21 is the heating element; 210 is the sliding seat; 211 is the roller; 212 is the guide tube; 213 is the heating rod; 214 is the induction wire; 22 is the adjusting end; 220 is the adjusting screw; 221 is the driven gear; 222 is the drive gear ring; 223 is the rotating sleeve; 23 is the extension sleeve; 230 is the keyway; 231 is the drive gear; 24 is the connecting guide plate; 240 is the sliding block; 241 is the compression spring; 25 is the drive shaft; 26 is the connecting rod; and 27 is the adjusting support rod. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 To be continued Figure 9 The embodiments of the present invention will be described in detail below.

[0034] This application discloses a square and rectangular tube R-angle forming device and method. The main application applies the process of rolling a round tube into a square and rectangular tube by adjusting the heating part to rotate and slide along the tube to heat the tube during the rolling process. This effectively reduces the local stress concentration problem that is easy to occur during the tube pressing and deformation process, and avoids the problem of excessively fast temperature loss at the corners affecting the forming quality.

[0035] Example 1: Refer to Figure 1 and Figure 2 As shown, a rectangular tube R-angle forming device includes a frame 1, on which a round tube 10 to be processed is placed and several rollers are installed on the four sides corresponding to the outer edge of the round tube 10. The rollers are spaced apart and aligned to form a square or rectangular shape to roll the round tube 10 into a rectangular tube 100. A guide component 2 for guiding the deformation of the round tube 10 is provided on the frame 1 corresponding to the tube conveying direction (i.e., the tube axis).

[0036] In use, the round tube 10 to be processed is inserted through the guide assembly 2 between several rolls. By driving the rolls to rotate on the surface of the round tube 10 and applying pressure, the round tube 10 is gradually compressed and shaped as it passes through. After multiple rolling passes, the round tube 10 is gradually shaped until it is fixed into the required square and rectangular tube 100 size and shape. The R-angles at the four corners of the square and rectangular tube 100 are also shaped accordingly, thus achieving the processing effect of the square and rectangular tube 100. It should be noted that during this process, rolls of different specifications need to be installed on the frame 1 according to the degree of deformation of the round tube 10 so as to guide the round tube 10 to gradually form into the square and rectangular tube 100.

[0037] Reference Figures 2 to 4 As shown, this is the guide assembly 2 used to guide the deformation of the circular tube 10; specifically, the guide assembly 2 includes: Mounting frame 20, with the corresponding pipes distributed on both sides of frame 1 along their axial direction.

[0038] Heating units 21 are provided at multiple corners of the rectangular tube 100 and are circumferentially distributed inside the mounting frame 20. As an optional embodiment, in this application, four heating units 21 are provided at the four corners of the rectangular tube 100 after forming. The four heating units 21 are gradually attached to the four corners of the rectangular tube 100 during the process of rolling the round tube 10 into the rectangular tube 100, so as to form the R-angle of the rectangular tube 100.

[0039] The adjustment end 22 is connected to a plurality of heating parts 21 and drives the plurality of heating parts 21 to slide and adjust on the mounting frame 20 so that the heating parts 21 abut against the pipe and achieve the effect of heating the pipe.

[0040] During the rolling and deformation of the round tube 10, the adjusting end 22 drives several heating parts 21 to slide towards the middle of the tube, causing all heating parts 21 to abut against the tube. Since heat always flows from high heat to low heat, the high heat generated by the heating part 21, upon contacting the low heat tube, causes a displacement effect between the heating part 21 and the tube, leading to a gradual increase in the temperature of the tube 212. After being heated, the yield strength of the tube decreases accordingly. After the heated tube is conveyed to several rolls, it is easier for the pressure of the rolls to guide its deformation, thus alleviating problems such as stress concentration that are prone to occur during the deformation of the tube.

[0041] Reference Figures 3 to 5As shown, the heating section 21 is used to guide the heating of the pipe to be processed. Specifically, the heating section 21 includes several sliding seats 210 that slide through the mounting frame 20. One end of the sliding seat 210 near the round pipe 10 is rotatably connected to a roller 211. The two ends of the roller 211 are symmetrically connected to two guide tubes 212 that rotatably pass through the sliding seat 210. The two guide tubes 212 are connected together to a heating rod 213 located in the roller 211. The heating rod 213 is preferably made of metal. An induction wire 214 is wound on the heating rod 213. A heating controller (not shown in the figure) is also installed on the sliding seat 210, and its positive and negative poles are electrically connected to the induction wire 214 respectively.

[0042] When the pipe needs to be heated, the induction wire 214 is energized by the heating controller. When the induction wire 214 is energized, it will generate eddy current effect at the heating rod 213 due to its winding contact with the heating rod 213, and generate a high-frequency magnetic field at the heating rod 213. The heating rod 213 in the high-frequency magnetic field will be heated by the magnetic field induction. As the roller 211 comes into contact with the pipe, the heat is transferred to the pipe, causing the pipe to be heated and made easier to roll and deform.

[0043] Reference Figures 4 to 8 As shown, the adjusting end 22 is used to drive the entire heating sliding seat 210 to slide and adjust. Specifically, the adjusting end 22 includes an adjusting screw 220 that is radially inserted into the mounting frame 20 and connected to the end of the sliding seat 210 away from the pipe. A driven gear 221 is sleeved on the end of the adjusting screw 220 that slides out of the mounting frame 20. All the driven gears 221 mesh with a drive gear ring 222 that is rotationally limited on the mounting frame 20. During use, rotating the drive gear ring 222 drives all the driven gears 221 that mesh with it to rotate. The driven gears 221 drive the connected adjusting screw 220 to rotate on the mounting frame 20, driving the adjusting screw 220 to drive the connected sliding seat 210 and rollers 211 to slide and adjust towards the middle of the pipe, so that the rollers 211 abut against the surface of the initial round pipe 10, thereby achieving the effect of guiding the round pipe 10 to heat up.

[0044] Reference Figure 4 and Figure 6As shown, in order to drive the adjusting screw 220 for adjustment, a rotating sleeve 223 is rotatably inserted onto the mounting frame 20 corresponding to the adjusting screw 220. The rotating sleeve 223 is threaded onto the adjusting screw 220 to drive the adjusting screw 220 to slide axially along the rotating sleeve 223 (that is, to slide radially relative to the mounting frame 20). At this time, the driven gear 221 is fixedly sleeved on the rotating sleeve 223. In use, the driven gear 221 rotates, driving the rotating sleeve 223 to rotate. The rotation of the rotating sleeve 223 drives the adjusting screw 220, which is threaded with it, to slide and adjust, so that the adjusting screw 220 slides radially relative to the mounting frame 20, thereby driving the roller 211 closer to the initial circular tube 10.

[0045] Furthermore, refer to Figure 6 and Figure 7 As shown, in order to improve the overall heating rate of the initial circular tube 10, the side of the mounting frame 20 near the frame 1 is connected to the frame 1 through an extension sleeve 23. The extension sleeve 23 is fixedly connected to the frame 1 and rotatably connected to the mounting frame 20. Several keyways 230 are evenly provided on the mounting frame 20 in the circumferential direction. The frame 1 is connected to the mounting frame 20 with drive gears 231 that mesh circumferentially with the keyways 230.

[0046] During the process of driving the drive gear 231 to rotate, the drive gear 231 drives the mounting frame 20, rotating sleeve 223, adjusting screw 220, sliding seat 210 and roller 211 to rotate around the circular tube 10 through several meshing keyways 230, so that several rollers 211 slide circumferentially on the outer edge of the circular tube 10, so as to guide the initial circular tube 10 to heat up evenly.

[0047] Reference Figure 6 and Figure 7 As shown, the drive gear ring 222 is fixedly connected to the extension sleeve 23 via the connecting guide plate 24. The connecting guide rod is bent, with one end connected to the drive gear ring 222 and the other end connected to the extension sleeve 23. During the process of driving the mounting frame 20, the rotating sleeve 223, and the driven gear 221 to rotate around the axis of the initial circular tube 10, several rotating driven gears 221 will slide circumferentially relative to the fixed drive gear ring 222. Through the meshing between the drive gear ring 222 and the driven gear 221, the driven gear 221 is driven to rotate around the circular tube 10 and also rotate around the connected rotating sleeve 223, thereby driving the adjusting screw 220 and the sliding seat 210 to slide and adjust as a whole, so that several rollers 211 abut against the surface of the circular tube 10.

[0048] Reference Figures 6 to 8As shown, after the drive gear ring 222 is fixed by the connecting guide plate 24, the entire mounting frame 20 needs to rotate continuously in the initial stage of rolling the round tube 10. During the continuous rotation of the mounting frame 20, the driven gear 221 will continuously mesh with the drive gear ring 222 to drive the adjusting screw 220 to slide towards the middle of the tube. However, the distance that the adjusting screw 220 can slide relative to the tube is limited. After the adjusting screw 220, the sliding seat 210 and the roller 211 slide and abut against the tube, the sliding tendency is restricted by the tube, which can easily cause the rotating sleeve 223 and the driven gear 221 to get stuck between the drive gear ring 222, thus easily hindering the overall rotation of the mounting frame 20.

[0049] Based on this, as an optional implementation, the drive gear ring 222 is connected to the connecting guide plate 24 via the sliding block 240. A limiting groove is formed on the connecting guide plate 24 corresponding to the sliding block 240. One part of the sliding block 240 is fixedly connected to the drive gear ring 222, and the other part is slidably limited in the limiting groove. A compression spring 241 is connected between the side of the sliding block 240 away from the drive gear ring 222 and the limiting groove.

[0050] In use, after the adjusting screw 220 and the sliding seat 210 are pressed against the pipe and their sliding tendency is restricted, the resulting reaction force drives the rotational force of the driven gear 221 to push the drive gear ring 222 and the sliding block 240 to slide away from the driven gear 221. This causes the drive gear ring 222 to temporarily disengage from the driven gear 221. While the sliding block 240 is pushed along the limiting groove, it drives the connected pressure spring 241 to be compressed and stored. During the process of the driven gear 221 and the drive gear ring 222 temporarily disengaging and then re-engaging, the pressure spring 241 repeatedly undergoes the process of being compressed and stored and then reset and released. At the same time, it also drives the sliding block 240 and the drive gear ring 222 to elastically float in contact with the driven gear 221, thus creating a relief effect on the rotation of the driven gear 221.

[0051] Furthermore, referring to Figure 8 As shown, in order to avoid the problem that the pressure spring 241 drives the sliding block 240 and the drive gear ring 222 to slide excessively, affecting the smoothness of the rotation of the driven gear 221 and the mounting frame 20, the sliding block 240 is set in a "T" shape, and its horizontal section is slidably limited in the limiting groove.

[0052] Reference Figure 2 and Figure 3As shown, a drive shaft 25 is fixedly threaded between the two drive gears 231 on both sides of the frame 1. A mounting side plate connected to the frame 1 is rotatably sleeved on the drive shaft 25. In use, the drive shaft 25 is driven to rotate using existing motor drive technology. The drive shaft 25 drives the two drive gears 231 to rotate, synchronously driving the mounting frames 20 and other components on both sides of the frame 1 to rotate and slide, thereby accelerating the process of guiding the tube to be rolled into shape.

[0053] It should be noted that during the rolling process of the round tube 10 by several rollers, the round tube 10 gradually transforms into the desired rectangular tube 100 shape. Therefore, during the rotation of the mounting frame 20 and the rollers 211 connected to it around the axis of the round tube 10, the rollers 211 also gradually deform with the round tube 10, and gradually only contact the corners of the deformed rectangular tube 100. That is, the side of the rollers 211 closest to the tube forms an external tangent circle trajectory tangent to the four corners of the rectangular tube 100 during rotation. During the process, the heating rod 213 and roller 211 will partially detach from the tube surface as the rolled tube deforms, and will circumferentially contact the corners of the deformed tube. This causes the heat at the corners to gradually exceed that of the four tube surfaces of the rectangular tube 100. At the same time, the tube surface of the rectangular tube 100 also has a certain temperature. This avoids the problem of excessive temperature difference between the corners of the rectangular tube 100 and the adjacent tube surfaces during the rolling process, which would cause the corners to lose heat too quickly and affect the forming quality. It also reduces the problem of local stress concentration that is easy to occur during the tube's compression deformation.

[0054] After the round tube 10 is rolled and deformed into a rectangular tube 100, the mounting frame 20 is driven to deflect by a certain degree until several rollers 211 are adjusted to abut against the four corners of the rectangular tube 100. This achieves the effect of local heating of the four corners of the deformed rectangular tube 100, further reducing the yield strength at the corners of the tube after deformation, enhancing the plasticity at the corners, and improving the forming rate and quality.

[0055] Example 2: Refer to Figures 6 to 9As shown in Example 1, during the rolling process of the formed round tube 10 into a square or rectangular tube 100, since the actual requirement is that the rolled tube may be square or rectangular, the rollers 211 may not correspond one-to-one with several corners of the formed tube. Therefore, in order to facilitate the heating treatment of several rollers 211 corresponding to the corners of the square (rectangular) tube, a connecting rotating rod 26 is provided on the sliding seat 210. The connecting rotating rod 26 is rotatably mounted on the adjusting screw 220 so that the sliding seat 210 can be adjusted. The 10 as a whole can be angled relative to the adjusting screw 220, so that when facing a square or rectangular tube, several rollers 211 can be driven to abut against the corner of the tube. Accordingly, in order to control the deflection of the sliding seat 210 about the connecting rod 26, several adjusting support rods 27 are provided on the mounting frame 20 corresponding to the sliding seat 210. The two ends of the adjusting support rods 27 are rotatably connected to the sliding seat 210 and the mounting frame 20, respectively. The adjusting support rods 27 are preferably spring telescopic rods.

[0056] When the round tube 10 needs to be rolled into a square tube, during the process of driving the mounting frame 20 and the sliding seat 210 to rotate and slide along the outer side of the initial round tube 10, that is, during the process of the mounting frame 20 and the sliding seat 210 sliding along the circumferential path of each corner of the formed square tube, since the diameter of each side of the square tube is the same and the radial distance of each corner of the square tube relative to the axis of the initial round tube 10 is the same, the rollers 211 on the sliding seat 210 will always remain in contact with the corners of the square tube under the elastic support of the adjusting support rod 27. At this time, the relative angle between the connecting rotating rod 26 and the adjusting screw 220 is fixed, the sliding seat 210 will not deflect additionally, and it will form a contact with each corner of the square tube and heat it.

[0057] When the circular tube 10 needs to be rolled into a rectangular tube, the difference in length between adjacent sides of the rectangular tube results in different radial distances between the corners relative to the axis of the initial circular tube 10. As the mounting frame 20 and the sliding seat 210 continue to rotate along the outer side of the initial circular tube 10, the adjacent sides of the rectangular tube of different lengths will cause the adjusting strut 27 to extend and slide due to the frictional stress between it and the rollers 211. This, in turn, causes the sliding seat 210 to adaptively deflect around the connecting rod 26, ensuring that the rollers 21 on the sliding seat 210... 1. It can be used to heat the corners of the rectangular tube. Similarly, during the process of the initial round tube 10 being transformed into a rectangular tube, the rollers 211 continuously deflect and slide and circumferentially abut against the corners of the rectangular tube. At the same time, they are out of contact with the tube surface. This effectively avoids the problem that the corner positions of the tube may change due to the change in the tube shape and it is difficult to correspond with several rollers 211. This ensures the uniformity and stability of heating at the corners of the square and rectangular tubes during the rolling process, and further improves the quality and accuracy of the R-corner forming of square and rectangular tubes of different specifications.

[0058] In addition, the present invention also provides a method for forming the radius (R) of square and rectangular tubes, comprising the following steps: S1: Place the initial circular tube 10 to be processed on the frame 1, and use the frame 1 and the guide assembly 2 to initially limit and hold the tube.

[0059] S2: After the pipe is installed, the heating part 21 heats the surface of the contacting round pipe 10, and the adjusting end 22 drives the heating part 21 to rotate and slide along the surface of the round pipe 10 to increase the uniformity of heating the round pipe 10 so as to roll the round pipe 10 into shape.

[0060] S3: During the process of forming the round tube 10 into the rectangular tube 100, the heating part 21 will gradually only contact the corners of the deformed rectangular tube 100 as the initial round tube 10 is rolled and deformed, thereby reducing the yield strength of each corner of the rectangular tube 100 during the forming process and improving the quality and speed of the rectangular tube R-corner forming.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A square and rectangular tube R-angle forming device, comprising a frame (1), characterized in that: A circular tube (10) to be processed and several rollers corresponding to the circular tube (10) are placed on the frame (1). A guide assembly (2) for guiding the deformation of the circular tube (10) is provided on the frame (1) in the direction of tube conveying. The guide assembly (2) includes: The mounting frame (20) is axially distributed on both sides of the frame (1); Heating section (21) is provided with multiple parts corresponding to the corners of the rectangular tube (100) and is distributed circumferentially inside the mounting frame (20), and can locally heat the corners of the rectangular tube (100) during the forming process; The adjustment end (22) is connected to a plurality of heating parts (21) and drives the plurality of heating parts (21) to slide and adjust on the mounting frame (20) so that the heating parts (21) abut against the pipe and guide the pipe to heat up so that it can be rolled. The heating part (21) includes several sliding seats (210) that slide through the mounting frame (20). A roller (211) is rotatably connected to one end of the sliding seat (210) near the round tube (10). Two guide tubes (212) that rotatably pass through the sliding seat (210) are symmetrically connected to both ends of the roller (211). A heating rod (213) located in the roller (211) is connected between the two guide tubes (212). An induction wire (214) is wound on the heating rod (213). The adjustment end (22) includes an adjustment screw (220) connected to the sliding seat (210) and radially passing through the mounting frame (20). One end of the adjustment screw (220) that passes through the mounting frame (20) is fitted with a driven gear (221). All the driven gears (221) mesh with a drive gear ring (222) that is rotationally limited on the mounting frame (20). The mounting frame (20) is provided with a rotating sleeve (223) that rotatably passes through the adjusting screw (220). The rotating sleeve (223) is threaded onto the adjusting screw (220), and the driven gear (221) is fixedly sleeved on the rotating sleeve (223). An extension sleeve (23) is provided on the side of the mounting frame (20) near the frame (1). The extension sleeve (23) is fixedly connected to the frame (1) and rotatably connected to the mounting frame (20). Several keyways (230) are also evenly provided on the mounting frame (20) in the circumferential direction. A drive gear (231) that meshes with the several keyways (230) in the circumferential direction is connected on the frame (1) corresponding to the mounting frame (20). The drive gear ring (222) is fixedly connected to the extension sleeve (23) through a bent connecting guide plate (24); The drive gear ring (222) is connected to the connecting guide plate (24) via a sliding block (240). A limiting groove is formed on the connecting guide plate (24) corresponding to the sliding block (240). A compression spring (241) is connected between the sliding block (240) and the limiting groove. The sliding block (240) is configured in a "T" shape, and its horizontal section is slidably confined within the limiting groove.

2. The square and rectangular tube R-angle forming device according to claim 1, characterized in that: The two drive gears (231) on both sides of the frame (1) are mutually limited by a drive shaft (25), and the drive shaft (25) is rotatably fitted with an installation side plate connected to the frame (1).

3. A method for forming the radius (R) of a rectangular tube, using a rectangular tube R-angle forming device as described in any one of claims 1-2, characterized in that, The molding method includes the following steps: S1: Place the initial round tube (10) to be processed on the frame (1), and use the frame (1) and guide assembly (2) to initially limit and hold the tube; S2: After the pipe is installed, the heating part (21) heats the surface of the contacting round pipe (10), and the adjusting end (22) drives the heating part (21) to rotate and slide along the surface of the round pipe (10) to increase the uniformity of heating the round pipe (10) so as to roll the round pipe (10) into shape. S3: During the process of forming the round tube (10) into the rectangular tube (100), the heating part (21) will gradually only contact the corners of the deformed rectangular tube (100) as the initial round tube (10) is rolled and deformed, thereby reducing the yield strength of each corner of the rectangular tube (100) during the forming process and improving the quality and speed of the R-angle forming of the rectangular tube (100).

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